Thank you, Alex! I think you've encountered a bug, and I'm glad you let me know about it. The demo should have had about 2 more "scenes" after the griffon encounter, and I think there may be a problem with the Mac version after all - specifically with saving. I'm going to work on that.
I really appreciate your feedback, and you can find more information about the soundtrack here. There's a chance that the tracks used in the demo won't be used in the final version of the game, but I still hope it won't turn this way. : )