The atmosphere of the game is pretty cool! The audio is also done integrated very nicely.
I was a bit confused as to how to progress in the game. I flipped the switch a lot of times and eventually a green 1 appeared on the screen. I tried a lot of other controls, but I couldn't open the door. It could be good to give the player a bit more instruction, though I recognize that there's a good balance to be found between helping the player and leaving room for mystery and exploration.
Cool game!