I absolutely love the dreamy artwork of this game and I like how it fits into the music (and vice-versa). I'd love to play a sequel! I'm no game programmer but it would be nice to extend the game longevity in some way. For instance, instead of "remixing" the same track you could create a nice piece of music and split it by music scores in different levels (eg: level 1 - percussion only; level 2 - chordophones only; ...; final level - all together!) or according to the height you reach. Oh, and some kind of unlockables for beating the game would be nice, such as a "Nirvana Mode" where you can see everything fully coloured from the beginning, just for fun. Anyway, the game was great. Keep up the good work!
PS: sorry for the mistakes, if you find any. I'm Italian and still learning. :)