I had to read the comments to understand the piano mechanics as I always pressed a key, then x, and it just exited - then I've tried playing a sequence and pressing x, but also didn't work. :D
Other than that the base concept was super interesting, loved the different skills (the little toad-thingy that didn't jump super high was the least obvious one though and I think I bugged in two of the ropes by activating them from the wrong angle 😜), and it all came together very nicely. I liked it a lot, well done!