I'm a sucker for rhythm games, and I think few are the games that play with the idea of the player doing the music, and I think the main mechanic was executed in a great way. It could be a "me" thing but I just there was or a different justification for the player to be the one making the music (so, for example, the "main" game could be a rhythm game but the musician decided to play the game as switched places with you) or the changes on the song having more impact on the environment. Overall, I appreciate the concept, the visuals and how simple the main mechanics look (and I can imagine how hard it was to implement). Good work :)