I had a hard time moving around with the slow controls, and the darkness got really annoying since I wasn't able to solve the puzzle on level 4 because of it. I didn't know if I was missing something or if the levers activated things out of sight :/
The level was actually pretty hard. the levers move doors that are out of sight and the hint is to use the pressure plates as well.
We'll definitely work on making it clearer though :D