Nice puzzle game ! I think you could work on the "lag" that occurs between each level (idk if you are loading another scene or something like that). You did a good job and it fits the theme !
Yeah I know, it's not really lag due to scene loading, it was put on purpose to give some time to process the level change, But I guess 1.5 seconds is a lot for a fast paced game like this, it makes it feel unresponsive. I will lower it in the next version.