Thanks for the comment! I really don't play platformers on keyboard so I pretty much do my playtests with a controller. Having experienced this jam, I really should get someone to evaluate future games on mouse and keyboard!
For music, I'd love to add some music but I didn't have enough time to find anything that fits the game and I'm not good at making music myself. Personally, I thought it was better to leave it "music less" than adding some tacky music that might harm the experience.