Programmer here. I made a simple prototype about a platformer-type game  in which you jump on a piano.

Gif here:

If you're an artist or composer, sound designer,  game designer, programmer etc. and you're interested you can contact me at Azul#2336 on discord so we can talk about what we could make of this game. Thanks

Link to prototype: https://simongamedev.itch.io/piano-platformer-prototype