I love it, but let me add a few suggestions in the spirit of constructive criticism:
- the head-bobbing and the feeling you are either drunk or on a boat, made me feel dizzy.
- the movement due to invisible walls felt pretty limited
- I find it weirdly convenient that the key was just there and that everything was everything abandoned
- obviously, someone still paying the bills for electricity
...these are details, although they matter :)
Everything else is simply amazing! I am surprised at how great the visual atmosphere is, and actually, I was blown away. Please do make a full game out of this, the world will be grateful :D