cool game idea with light and darkness. cool music, fits the game.
I am not sure if you were going for these style of collisions/wall sliding etc.
i could somehow cheese a few levels because i could wallhack/run on the ceiling etc, if i jumped a lot.
I find the horizontal movement could be a little faster.
A lot of levels, did manage to finish a lot, but still didn`t beat the game completly.
Well done for under 3hours!