You're right it's not very clear what the answer is to each level. I only had 2 hours left to make levels since I spent the rest of the time learning godot lol. It was supposed to be so that the sounds the notes play don't match the backing music, and you have to move them so they match - so they're in the same key, or scale. There were also gonna be more checkboxes on the right representing which notes were correct, but yeah it was very rushed.

I just rated your game. I like the idea of a platformer with an alternate world in a square you can carry around. It was a bit tricky to control the square's size, so maybe it needs some grab handles on its corners or something.