Loved this! I think my favorite level was the last, because it was challenging enough for me to retry a bunch of times, but not too much to deem it impossible or frustrating. Had to write down on paper the combination I thought would work best to solve it. This looks like it would have potential for a full game. I think it would've been a cute detail if all the notes you rescued at the end had sang together in harmony as thanks haha. Good job with this!