Added pause capability to all levels, added music to Level 5, added a simple chasing AI to the glowing ghosts, and optimized the Main Menu scene

GUI/Pause Screen.gd

@@ -0,0 +1,39 @@
+extends CanvasLayer
+
+
+func _on_resume_button_pressed() -> void:
+    resume()
+    return
+
+
+func _on_quit_button_pressed() -> void:
+    get_tree().quit()
+    return
+
+
+func _on_resume_button_mouse_entered() -> void:
+    $'Menu Button Hover'.play(0.0)
+    return
+
+
+func _on_quit_button_mouse_entered() -> void:
+    $'Menu Button Hover'.play(0.0)
+    return
+
+
+func _input(event: InputEvent) -> void:
+    if event.is_action_pressed('ui_cancel'):
+        if get_tree().paused:
+            resume()
+        else:
+            get_tree().paused = true
+            $Background.visible = true
+            $Menu.visible = true
+    return
+
+
+func resume() -> void:
+    $Background.visible = false
+    $Menu.visible = false
+    get_tree().paused = false
+    return