A very ambitious platformer for a jam setting. Seems like a lot was planned from the start. Interesting to see how it will shape up after the jam.
For that I'd suggest honing in on the the player controls and making sure those feel super good. Feels like there might be coyote time implemented but an input buffer is missing. Ideally jump should never be up arrow or W but space. It just feels a little awkward. Pressing Z to punch also feels odd when using A and D to move. The reach of the punch could also be longer and the size of the fists exaggerated. Sometime it's a little hard to tell what's part of the background and what's a platform. Here you could use colour, saturation and contrast to gently guide the player's eye around the level.
I had a challenging time with the second level. It's difficult to get on the first platform without taking damage from the above enemy. I managed to fall off the map here as well. It also took me a while to realize there was wall jumping and how to perform it. Sometimes I'd get stuck in the glide animation but I beat the level eventually.
The visuals have a lot personality. It reminds me of something you'd find on Newgrounds. I wouldn't mind seeing more of these characters. Very impressive for a week of work!