It's a cool idea. unfortunetly it's very very hard (too much for a jam game). Which is rarely a good thing for a jam, since you want most player to be able to see all the work you have put in the game.

In term of feedbacks:
The jumps seemed a bit incosistent from time to time depending on how to timed them.
My guess is your controller is physic based which can be tricky to set up for a platformer.

I wasn't able to go very far so I won't have a lot of feedback to give in term of level design.
The little I notice is that some wall jump were unnecessarily hard, with spike too close from each others, leaving almost no room for error very early in the game.

I hope that helps. Good job on finishing the jam :)

really interesting idea, I enjoy the idea of playing with light and dark as a game mechanic. I really struggled with the wall jumps so wasn't able to make it as far as I would have liked, but what I did play had a really nice atmosphere and felt nice to control. good use of assets to create a cohesive experience!