level now detects (in a very rudimentary way, by checking every frame) whether all blocks have been broken

scenes/mainmenu.gd

@@ -3,6 +3,7 @@ extends Control
 # Called when the node enters the scene tree for the first time.
 func _ready():
 	pass # Replace with function body.
+	randomize()
 
 # Called every frame. 'delta' is the elapsed time since the previous frame.
 func _process(delta):