I really really liked the idea! I love rhythm games and this is a wonderful addition to the jam! I don't know how you managed to sync the music with the game, but I believe it has something to do with frametime, as on my PC the sync is not that perfect.
Also, I think you could have made the songs gradually increase in difficulty, rather than obliterating the player with such a big amount of notes to hit right from the start.
It's a nice idea, with nice music, but of course it needs more polish!
Good job with the graphics and the snappy feel