Three kinds of bullets are firing, bomb breaks the wall

Assets/Scripts/Bomb.cs

@@ -0,0 +1,22 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Bomb : MonoBehaviour {
+	public float timer;
+
+	GameObject explosion;
+
+	void Awake() {
+		StartCoroutine (ExplodeAfter (timer));
+
+		explosion = transform.GetChild (0).gameObject;
+	}
+
+	IEnumerator ExplodeAfter(float delay) {
+		yield return new WaitForSeconds (delay);
+		explosion.SetActive (true);
+		transform.DetachChildren ();
+		Destroy (gameObject);
+	}
+}