First of all I would like to say that the music is very good!
I like the main mechanic, but feel like every level had only one correct "answer". I don't know if that's what you were going for tho.
It was nonetheless an enjoyable experience to figure out the correct "answer" to your levels.
Side Note: When I completed the last level I ended up with a blackscreen instead of the menu/credits, I'm not sure if that's a bug or not.