Awesome game. Starting with visuals and soundtrack to the core mechanics of the game it is nearly perfect in what it tried to achieve, all of that in just 48 hours. I'm not great at platformers so I very much enjoy the puzzle aspect of the game. If I would have to point some things out to further improve the game I would say that it would benefit from displaying health and function of the keys used somewhere on the screen with the keyboard folded (or atleast the health of it). That's just my thought, but if your design idea was to hide it so people have to memorize it and get a feel of how much you can use the key I get it and completely support you in staying with the idea.
I have to say that there are simmilar games in this jam, or that this game could be a mix of 2 games from this jam, but to me this one takes the cake as the best designed and polished one.
Keep up the good work!