Open-sourced some code

Scripts/User Interface/Menus/SaveMenu/Heading.cs

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+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using UnityEngine;
+using TMPro;
+
+namespace MenuSystem {
+	public class Heading : MonoBehaviour {
+		void Start() {
+			TextMeshProUGUI text = GetComponent<TextMeshProUGUI>();
+
+			if (!File.Exists(SaveFileManager.saveSlotFileName)) {
+				text.text = "Save The Game?";
+			}
+		}
+	}
+}

Scripts/User Interface/Menus/SaveMenu/HideMeIf.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace MenuSystem {
+	public class HideMeIf : MonoBehaviour {
+		public SaveHandler saveHandler;
+
+		void OnEnable() {
+			if (!saveHandler.saveMenuAvailable) {
+				gameObject.SetActive(false);
+			}
+		}
+	}
+}

Scripts/User Interface/Menus/SaveMenu/SaveGame.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace MenuSystem {
+	public class SaveGame : MenuOption {
+		public SaveHandler saveHandler;
+
+		public Canvas oldMenu;
+		public Canvas newMenu;
+
+		public override void Execute() {
+			//calculate playtime
+			SaveFileManager.LoadedSaveSlot.secondsPlaying += Time.time - saveHandler.startTime;
+			saveHandler.startTime = Time.time;
+
+			//save the game
+			SaveFileManager.SaveData(SaveFileManager.LoadedSaveSlot, SaveFileManager.saveSlotFileName);
+			oldMenu.gameObject.SetActive(false);
+			newMenu.gameObject.SetActive(true);
+		}
+
+		public override void Scroll(float x) {
+			//DO NOTHING
+		}
+	}
+}