diff --git a/Toy b/Toy
index 6a08639..3460967 160000
--- a/Toy
+++ b/Toy
@@ -1 +1 @@
-Subproject commit 6a086395be0d7824b4a83efddb14d457eaaf299d
+Subproject commit 3460967e3bd30df15a6cc2bc9f7b169d15b33abc
diff --git a/core/engine.c b/core/engine.c
index 7d4196d..47316e4 100644
--- a/core/engine.c
+++ b/core/engine.c
@@ -68,7 +68,9 @@ static void execStep(Engine* engine) {
 			case SDL_WINDOWEVENT: {
 				switch(event.window.event) {
 					case SDL_WINDOWEVENT_RESIZED:
-						SDL_RenderSetLogicalSize(engine->renderer, event.window.data1, event.window.data2);
+						engine->screenWidth = event.window.data1;
+						engine->screenHeight = event.window.data2;
+						SDL_RenderSetLogicalSize(engine->renderer, engine->screenWidth, engine->screenHeight);
 					break;
 				}
 			}
diff --git a/core/engine_node.c b/core/engine_node.c
index cffb571..d8ec209 100644
--- a/core/engine_node.c
+++ b/core/engine_node.c
@@ -1,2 +1,120 @@
 #include "engine_node.h"
 
+#include "memory.h"
+
+void initEngineNode(EngineNode* node, Interpreter* interpreter, void* tb, size_t size) {
+	//init
+	node->children = NULL;
+	node->capacity = 0;
+	node->count = 0;
+	node->functions = ALLOCATE(LiteralDictionary, 1);
+	initLiteralDictionary(node->functions);
+
+	//run bytecode
+	runInterpreter(interpreter, tb, size);
+
+	//grab all top-level function literals
+	LiteralDictionary* variablesPtr = &interpreter->scope->variables;
+
+	for (int i = 0; i < variablesPtr->capacity; i++) {
+		//skip empties and tombstones
+		if (IS_NULL(variablesPtr->entries[i].key)) {
+			continue;
+		}
+
+		//if this variable is a function
+		_entry* entry = &variablesPtr->entries[i];
+		if (IS_FUNCTION(entry->value)) {
+			//save a copy
+			setLiteralDictionary(node->functions, entry->key, entry->value);
+		}
+	}
+}
+
+void pushEngineNode(EngineNode* node, EngineNode* child) {
+	//push to the array (prune tombstones when expanding/copying)
+	if (node->count + 1 > node->capacity) {
+		int oldCapacity = node->capacity;
+
+		node->capacity = GROW_CAPACITY(oldCapacity);
+		node->children = GROW_ARRAY(EngineNode, node->children, oldCapacity, node->capacity);
+	}
+
+	//prune tombstones (experimental)
+	int counter = 0;
+	for (int i = 0; i < node->capacity; i++) {
+		if (i >= node->count) {
+			node->count = counter;
+			break;
+		}
+
+		//move down
+		if (node->children[i].functions != NULL) {
+			node->children[counter++] = node->children[i];
+		}
+	}
+
+	//zero the rest
+	while (counter < node->capacity) {
+		node->children[counter].children = NULL;
+		node->children[counter].capacity = 0;
+		node->children[counter].count = 0;
+		node->children[counter].functions = NULL;
+		counter++;
+	}
+
+	//assign
+	node->children[node->count++] = *child;
+}
+
+void freeEngineNode(EngineNode* node) {
+	//free and tombstone this node
+	for (int i = 0; i < node->capacity; i++) {
+		freeEngineNode(&node->children[i]);
+	}
+
+	FREE_ARRAY(EngineNode, node->children, node->capacity);
+
+	if (node->functions != NULL) {
+		freeLiteralDictionary(node->functions);
+	}
+
+	FREE(LiteralDictionary, node->functions);
+
+	node->children = NULL;
+	node->capacity = -1;
+	node->count = -1;
+	node->functions = NULL;
+}
+
+static void callEngineNodeLiteral(EngineNode* node, Interpreter* interpreter, Literal key) {
+	//if this fn exists
+	if (existsLiteralDictionary(node->functions, key)) {
+		Literal fn = getLiteralDictionary(node->functions, key);
+
+		LiteralArray dummyArray;
+		initLiteralArray(&dummyArray);
+
+		callLiteralFn(interpreter, fn, &dummyArray, &dummyArray);
+
+		freeLiteralArray(&dummyArray);
+
+		freeLiteral(fn);
+	}
+
+	//recurse to the (non-tomstone) children
+	for (int i = 0; i < node->count; i++) {
+		if (node->children[i].functions != NULL) {
+			callEngineNodeLiteral(&node->children[i], interpreter, key);
+		}
+	}
+}
+
+void callEngineNode(EngineNode* node, Interpreter* interpreter, char* fnName) {
+	//call "fnName" on this node, and all children, if it exists
+	Literal key = TO_IDENTIFIER_LITERAL(copyString(fnName, strlen(fnName)), strlen(fnName));
+
+	callEngineNodeLiteral(node, interpreter, key);
+
+	freeLiteral(key);
+}
diff --git a/core/engine_node.h b/core/engine_node.h
index 496c2fb..bf90745 100644
--- a/core/engine_node.h
+++ b/core/engine_node.h
@@ -2,22 +2,25 @@
 
 #include "common.h"
 
+#include "literal_dictionary.h"
+#include "interpreter.h"
+
 //forward declare
 typedef struct _engineNode EngineNode;
-typedef struct _engine Engine;
-
-//the interface function
-typedef void (*EngineNodeFn)(EngineNode* self, Engine* engine);
 
 //the node object, which forms a tree
 typedef struct _engineNode {
 	//use Toy's memory model
-	void* children;
+	EngineNode* children;
 	int capacity;
-	int count;
+	int count; //includes tombstones
 
-	EngineNodeFn onInit;
-	EngineNodeFn onStep;
-	EngineNodeFn onFree;
+	//toy functions, stored in a dict for flexibility
+	LiteralDictionary* functions;
 } EngineNode;
 
+CORE_API void initEngineNode(EngineNode* node, Interpreter* interpreter, void* tb, size_t size); //run bytecode, then grab all top-level function literals
+CORE_API void pushEngineNode(EngineNode* node, EngineNode* child); //push to the array (prune tombstones when expanding/copying)
+CORE_API void freeEngineNode(EngineNode* node); //free and tombstone this node
+
+CORE_API void callEngineNode(EngineNode* node, Interpreter* interpreter, char* fnName); //call "fnName" on this node, and all children, if it exists
diff --git a/core/makefile b/core/makefile
index 826525c..d0e5adc 100644
--- a/core/makefile
+++ b/core/makefile
@@ -1,8 +1,8 @@
 CC=gcc
 
-IDIR+=.
-CFLAGS+=$(addprefix -I,$(IDIR)) -DSDL_MAIN_HANDLED -g -Wall -W -pedantic -Wno-unused-parameter -Wno-unused-function -Wno-unused-variable
-LIBS+=-lSDL2
+IDIR+=. ../Toy/source
+CFLAGS+=$(addprefix -I,$(IDIR)) -DSDL_MAIN_HANDLED -g -Wall -W -Wno-unused-parameter -Wno-unused-function -Wno-unused-variable
+LIBS+=-lSDL2 -ltoy
 
 ODIR = obj
 SRC = $(wildcard *.c)
@@ -24,10 +24,10 @@ else
 endif
 
 library: $(OBJ)
-	$(CC) -DCORE_EXPORT $(CFLAGS) -shared -o $(OUT) $(LIBLINE) $(LIBS)
+	$(CC) -DCORE_EXPORT $(CFLAGS) -shared -o $(OUT) $(LIBLINE) -L../$(LIBDIR) $(LIBS)
 
 static: $(OBJ)
-	ar crs $(CORE_OUTDIR)/lib$(OUTNAME).a $(OBJ) $(LIBS)
+	ar crs $(CORE_OUTDIR)/lib$(OUTNAME).a $(OBJ) -L../$(LIBDIR) $(LIBS)
 
 $(OBJ): | $(ODIR)
 
diff --git a/makefile b/makefile
index b2c44f2..9c4df5c 100644
--- a/makefile
+++ b/makefile
@@ -13,6 +13,9 @@ toy: $(LIBDIR)
 core: $(LIBDIR)
 	$(MAKE) -C core
 
+test: clean $(OUTDIR) toy core
+	$(MAKE) -C test
+
 $(OUTDIR):
 	mkdir $(OUTDIR)
 
diff --git a/source/main.c b/source/main.c
index e42d183..2bf2c9a 100644
--- a/source/main.c
+++ b/source/main.c
@@ -1,11 +1,11 @@
 #include "engine.h"
 
 int main(int argc, char* argv[]) {
-	Engine engine = { .screenWidth = 640, .screenHeight = 480 };
+	Engine engine = { .screenWidth = 800, .screenHeight = 600 };
 
 	initEngine(&engine);
 	execEngine(&engine);
 	freeEngine(&engine);
 
 	return 0;
-}
\ No newline at end of file
+}
diff --git a/source/makefile b/source/makefile
index e7fbc96..afa9f4c 100644
--- a/source/makefile
+++ b/source/makefile
@@ -1,7 +1,7 @@
 CC=gcc
 
 IDIR+=. ../Toy/source ../core
-CFLAGS+=$(addprefix -I,$(IDIR)) -DSDL_MAIN_HANDLED -g -Wall -W -pedantic -Wno-unused-parameter -Wno-unused-function -Wno-unused-variable
+CFLAGS+=$(addprefix -I,$(IDIR)) -DSDL_MAIN_HANDLED -g -Wall -W -Wno-unused-parameter -Wno-unused-function -Wno-unused-variable
 LIBS+=-lSDL2 -ltoy -lcore
 
 ODIR = obj
diff --git a/test/makefile b/test/makefile
new file mode 100644
index 0000000..851fc91
--- /dev/null
+++ b/test/makefile
@@ -0,0 +1,39 @@
+CC=gcc
+
+IDIR+=. ../Toy/source ../core
+CFLAGS+=$(addprefix -I,$(IDIR)) -g -Wall -W -Wno-unused-parameter -Wno-unused-function -Wno-unused-variable
+LIBS+=-lSDL2 -ltoy -lcore
+
+ODIR = obj
+TARGETS = $(wildcard ../core/*.c)
+TESTS = $(wildcard *.c)
+OBJ = $(addprefix $(ODIR)/,$(TARGETS:../core/%.c=%.o)) $(addprefix $(ODIR)/,$(TESTS:.c=.o))
+
+.PRECIOUS:  $(TESTS:%.c=../$(OUTDIR)/%.exe)
+
+all: $(OBJ) $(TESTS:%.c=../$(OUTDIR)/%.exe)
+
+../$(OUTDIR)/%.exe: $(ODIR)/%.o
+	@$(CC) -o $@ $< $(TARGETS:../core/%.c=$(ODIR)/%.o) $(CFLAGS) -L../$(LIBDIR) $(LIBS)
+	cp ../$(LIBDIR)/*.dll ../$(OUTDIR)
+ifeq ($(shell uname),Linux)
+	valgrind --leak-check=full --track-origins=yes $@
+else
+	$@
+endif
+
+$(OBJ): | $(ODIR)
+
+$(ODIR):
+	mkdir $(ODIR)
+
+$(ODIR)/%.o: %.c
+	@$(CC) -c -o $@ $< $(CFLAGS)
+
+$(ODIR)/%.o: ../core/%.c
+	@$(CC) -c -o $@ $< $(CFLAGS)
+
+.PHONY: clean
+
+clean:
+	$(RM) $(ODIR)
diff --git a/test/scripts/child_engine_node.toy b/test/scripts/child_engine_node.toy
new file mode 100644
index 0000000..46ef7b3
--- /dev/null
+++ b/test/scripts/child_engine_node.toy
@@ -0,0 +1,14 @@
+var tally: int = 0;
+
+fn onInit() {
+	print "child init called";
+}
+
+fn onStep() {
+	print "child step called";
+	print ++tally;
+}
+
+fn onFree() {
+	print "child free called";
+}
\ No newline at end of file
diff --git a/test/scripts/parent_engine_node.toy b/test/scripts/parent_engine_node.toy
new file mode 100644
index 0000000..b78ceef
--- /dev/null
+++ b/test/scripts/parent_engine_node.toy
@@ -0,0 +1,11 @@
+fn onInit() {
+	print "init called";
+}
+
+fn onStep() {
+	print "step called";
+}
+
+fn onFree() {
+	print "free called";
+}
\ No newline at end of file
diff --git a/test/test_engine_node.c b/test/test_engine_node.c
new file mode 100644
index 0000000..fefaf60
--- /dev/null
+++ b/test/test_engine_node.c
@@ -0,0 +1,156 @@
+#include "engine_node.h"
+
+#include "lexer.h"
+#include "parser.h"
+#include "compiler.h"
+#include "interpreter.h"
+#include "console_colors.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+//compilation functions
+char* readFile(char* path, size_t* fileSize) {
+	FILE* file = fopen(path, "rb");
+
+	if (file == NULL) {
+		fprintf(stderr, ERROR "Could not open file \"%s\"\n" RESET, path);
+		exit(-1);
+	}
+
+	fseek(file, 0L, SEEK_END);
+	*fileSize = ftell(file);
+	rewind(file);
+
+	char* buffer = (char*)malloc(*fileSize + 1);
+
+	if (buffer == NULL) {
+		fprintf(stderr, ERROR "Not enough memory to read \"%s\"\n" RESET, path);
+		exit(-1);
+	}
+
+	size_t bytesRead = fread(buffer, sizeof(char), *fileSize, file);
+
+	buffer[*fileSize] = '\0'; //NOTE: fread doesn't append this
+
+	if (bytesRead < *fileSize) {
+		fprintf(stderr, ERROR "Could not read file \"%s\"\n" RESET, path);
+		exit(-1);
+	}
+
+	fclose(file);
+
+	return buffer;
+}
+
+unsigned char* compileString(char* source, size_t* size) {
+	Lexer lexer;
+	Parser parser;
+	Compiler compiler;
+
+	initLexer(&lexer, source);
+	initParser(&parser, &lexer);
+	initCompiler(&compiler);
+
+	//run the parser until the end of the source
+	ASTNode* node = scanParser(&parser);
+	while(node != NULL) {
+		//pack up and leave
+		if (node->type == AST_NODEERROR) {
+			printf(ERROR "error node detected\n" RESET);
+			freeNode(node);
+			freeCompiler(&compiler);
+			freeParser(&parser);
+			return NULL;
+		}
+
+		writeCompiler(&compiler, node);
+		freeNode(node);
+		node = scanParser(&parser);
+	}
+
+	//get the bytecode dump
+	unsigned char* tb = collateCompiler(&compiler, (int*)(size));
+
+	//cleanup
+	freeCompiler(&compiler);
+	freeParser(&parser);
+	//no lexer to clean up
+
+	//finally
+	return tb;
+}
+
+int main() {
+	{
+		//setup interpreter
+		Interpreter interpreter;
+		initInterpreter(&interpreter);
+
+		size_t size = 0;
+
+		char* source = readFile("./scripts/parent_engine_node.toy", &size);
+		unsigned char* tb = compileString(source, &size);
+
+		//create and test the engine node
+		EngineNode node;
+
+		initEngineNode(&node, &interpreter, tb, size);
+
+		callEngineNode(&node, &interpreter, "onInit");
+		callEngineNode(&node, &interpreter, "onStep");
+		callEngineNode(&node, &interpreter, "onFree");
+
+		freeEngineNode(&node);
+
+		//free
+		free((void*)source);
+		freeInterpreter(&interpreter);
+	}
+
+	{
+		//setup interpreter
+		Interpreter interpreter;
+		initInterpreter(&interpreter);
+
+		size_t size = 0;
+
+		char* source = readFile("./scripts/parent_engine_node.toy", &size);
+		unsigned char* tb = compileString(source, &size);
+
+		//create and test the engine node
+		EngineNode node;
+
+		initEngineNode(&node, &interpreter, tb, size);
+		resetInterpreter(&interpreter);
+
+		for (int i = 0; i < 10; i++) {
+			char* source = readFile("./scripts/child_engine_node.toy", &size);
+			unsigned char* tb = compileString(source, &size);
+
+			EngineNode child;
+			initEngineNode(&child, &interpreter, tb, size);
+			resetInterpreter(&interpreter);
+
+			pushEngineNode(&node, &child);
+		}
+
+		//test the calls
+		callEngineNode(&node, &interpreter, "onInit");
+
+		for (int i = 0; i < 10; i++) {
+			callEngineNode(&node, &interpreter, "onStep");
+		}
+
+		callEngineNode(&node, &interpreter, "onFree");
+
+		//free
+		freeEngineNode(&node);
+		free((void*)source);
+		freeInterpreter(&interpreter);
+	}
+
+	printf(NOTICE "All good\n" RESET);
+	return 0;
+}