This game is pretty solid especially considering it was made in a gamejam. I think the only thing I'd change would be the friction in air (it's not snappy), obviously it's up to you but I think considering it's a skill based platformer I think acceleration should be low and friction should be high. Also I'm not a huge fan of how the character kind of snaps to the wall. I think it would be better if it would only slide down the wall if you were pushing towards the wall. Other than that awesome work. I like the music too!