Very interesting! I'm not sure if i had the intended visual experience. I have a 4k monitor and the darkness didn't extend all the way to the edges. A world of light always out of reach.
The light puzzles were very cool! A simple yet effective mechanic like that is always fun to build upon and see where it goes.
I didn't really feel that the monster's were additive to the experience but that might just be me.
Good job!