Fun game! I agree with the rest of the comments here -- most of all, it would be great if there was more feedback to know if you are playing the notes correctly, both visually and auditorily. I think it'd be pretty sweet to hear those same drum patterns coming from your own fingers!
The music was really good. I most enjoyed the second song because its charting was at my level. I think overall the game had a lot of personality. For example Kyouko's black outfit was pretty cool. I enjoyed the story and, sure while we know these two are in a band in the official works, it's awesome to finally know what they'd sound like!