If you're in windows, open command line and start the game with opengl3 by typing: " <path to the game> --rendering-driver opengl3 " (without the quotation marks).
That was a really fun demo! Puzzles weren't too hard, but I can see the potential in those mechanics. Love you, Mark. Wishlisted.
I loved the atmosphere in your game, it was deliciously foreboding. Wish there was more content.