very interesting! remind me of the game called dark echo. Your game has more puzzle element and I like how you can interact with instrument and how you place the little classic puzzle in the game.
BUT! I got stuck on the beginning of level 6. it stuck at the beginning, I tried to clap but nothing happens :(...
I hope you get enough time to fix it before the end of the jam!
(and it might be a good idea to provide cheat button to skip levels, when things like this happens, so player has a way to skip broken levels.. if possible...)