Oh, this is so good! This is the perfect demo, it sets the scene, has you puzzling around figuring things out to show what to expect and leaves you wanting a whole lot more!
I did bump into the audio issue as well (wish I'd checked some of the comments below before bumbling around thinking there was no sound for the first quarter of an hour I was playing haha), but once I got it up and going it added even more atmosphere, which I suppose is the point is a good soundtrack!
Anywho, the game flows really nicely, it's painted a very interesting story and I cannot wait to see more from you =) keep up the awesome work!