Added a pause menu with options to continue or quit.

scenes/Levels/menu.gd

@@ -0,0 +1,24 @@
+extends CanvasLayer
+
+@onready var pause_menu = $Control
+
+func _input(event):
+	if event.is_action_pressed("ui_cancel"):
+		if get_tree().paused:
+			resume_game()
+		else:
+			pause_game()
+
+func pause_game():
+	get_tree().paused = true
+	visible = true
+
+func resume_game():
+	get_tree().paused = false
+	visible = false
+
+func _on_quit_button_pressed():
+	get_tree().quit()
+
+func _on_continue_button_pressed():
+	resume_game()