Five. Stars.
The slow change overtime in the world added to whatever horror was going on. I knew I'd be next at one point, and it drove me to keep going. I questioned everything but in the end we didn't get an answer. Instead it was I (the player) who had to think about what occurred and what it was about. It really stirred my mind. The graphics/music were superb. The slight off-ness of the guitar made everything feel uneasy in the game and led you to wonder more. For a 48 hour challenge this is exceptional.
For those of you giving a bad rating because it "forces" you to play in full screen, you can press the [esc] key and play normally.