I really love this game.
We had a similar idea (in ours the character shoots automatically to the beat of music) and I love your execution! The puzzle nature of it makes it so awesome, after a while it just feels natural to play the game. Something that I'd love to see is the pattern changing, instead of 1 2 3 jump, it becomes 1 jump 1 jump, or if the song is 3/4 isntead of 4/4 it becomes 1 2 jump 1 2 jump.
Also, I don't know if it was intended but when I got the giant seed the game got stuck in that screen.