Playing this at midnight wasn’t the best decision!
Really great gameplay and ambience, great job. You’ve nailed it.
One change that I can think of is that maybe you should maybe add a minimap that is slowly revealed. Although as you mentioned elsewhere, using pen and paper and sketching the path yourself has a different level of satisfaction on winning.
(PS: For some reason using my trackpad makes the player look up and down instead of left and right. I don’t know if this is a problem just with my device though.)