This game was really fun! I wished it was more fleshed out because the concept is great. I think that if you continue this project, you should make the levels more linear so that most players will create a melody that you set in place (for example, if in the level there's three jumps then turn around, then the player will do that, and it'll create a nice melody)
Drums where a nice addition, I had fun making tunes with them :)
Good luck in the jam!