I managed to get to the exit! Took me a couple tries though. The first time I pushed one of the key blocks right into a corner, and despite trying from multiple angles wasn't able to free it so had to restart.
The sound and atmosphere is really on point here. I even think the greybocked level works kinda well for this type of game. The AI on the zombies was fairly impressive, I liked being able to lure them away from the blocks I needed to free them up (but then they'd kinda go back and patrol that area.)
I had a LOT of trouble finding my way around in the opening area and would have been helpful to have a flashlight there. It was so dark I sometimes ran into walls without realizing it.
Great submission!