I get the idea and find a fun one especially like a sneaky way to teach keyboard layouts. ;) I agree with some of the previous comments that maybe outlining for 2-3 frames where the next square will appear would make it more enjoyable and making the squares appear more in synced with the music would have nailed it for me and me dance with my fingers to the beat of the music. ;) :D However, seeing this was a 4hr project I say "nicely done"