I really loved it too, really brainy. The two final levels, ah, made me like break it all :D
But I finally managed to make it through. Congrats to the developer!
I really like this game, and the piano, it's just beautiful! I wonder if the songs were written by the game author or if they belong to some known suthor(s), does anybody know?
 "The Company of Myself"){kind=icon}
 "Music Catch 2"){kind=icon}