A maze full of zombies... my worst nightmare maybe. This made me really anxious, in a good way :)
I like the idea of using the light to make walls and floor disappear, that's a nice mechanic. Also the fact that some items don't do anything is interesting.
And I really liked the fact that you added several difficulty level, gives the possibility to replay the game.
On the downside, the controls are really clunky. Mouse sensitivity is way too high by default and I didn't find how to reduce it even though it is stated in the controls (pressing ESC only took me in and out of full screen mode, might be due to my browser I don't know)
Thanks for the fun anyways :)