implemented level select, options menu, different audio buses & sliders

src/gui/menu/options.gd

@@ -1,11 +1,4 @@
 extends Control
 
-
-# Called when the node enters the scene tree for the first time.
-func _ready():
-	pass # Replace with function body.
-
-
-# Called every frame. 'delta' is the elapsed time since the previous frame.
-func _process(delta):
-	pass
+func _on_back_button_pressed():
+	queue_free()