I did run into a couple bugs, but otherwise, I really liked this. First bug, crawling through the vent I got stuck in the top of it and couldn't move. Second bug, exiting and re-entering the vent sends me back to the beginning. The third issue I noticed (which I don't think was a bug); the killer "chase" music just turns on and there was no chase.
After a minute or so, killer just shows up and *wham* dead. Not sure if I triggered him in the wrong spot or that part is just kind of unfinished since it's a demo. Either way, this was awesome and I'm looking forward to the full release.