This is an interesting concept, I like the idea of stumbling through the dark working only off audio cues. Admittedly I had no idea how to find the key though, I stumbled into the drawers, bumped into walls, avoided the electric warning spots (since I died from one before) but could never find it.
Also I'm not sure if it was intentional but it seemed weird how sometimes the voiceover audio would come out the left ear, and other times the right. I mean specifically with the persons voice, for the cat or bumping into things it kinda made sense.