Even after reading the game page and doing easy mode, it was super hard to figure out what to do, but I guess I got there eventually.
The animations are nice and it's cool they take up less than 25k. Would be cool if you could use the remaining 39k to add music and make it a basic rhythm game; I did notice you timed out the animations so they would stay synced to music.
Edit: Seems like it's 120bpm if anyone else wants to try adding their own music.