I know what it needs, it need buttons so that instead of clicking them it could be like S, R, B
Snare, Ride, Base, so you could make an awesome beat. another thing, a splash cymbal, and a high hat.
More difficultly levels, the music sometimes ran together making an eary sound, and more shapes and things. Also sometimes in the upper levels it will lag because of so many shapes, maybe you could have something that could push shapes out of the way to get to tiles below, does that make sense?