Great demo so far! I was absolutely engrossed the whole way through and really enjoyed the story and characters so far. I'd definitely love to play more chapters whenever they come out.
I played the Mac demo and didn't run into any bugs per se, but I did find a few of the buttons a bit unresponsive. In particular the triangular back button, the Respond button and the Submit button during the card puzzles. It took a few clicks to get them to work.