That was pretty cool, gotta say it was impressive. The atmosphere was perfect, and the level design simply beautiful in many areas. Though, I do have a few, albeit minor complaints. In some areas there were holes in the geometry (noclip) that were very easy to see, or even to reach. At some points the lighting was very dark, though it may be my brightness settings, so that probably was just me. Some of the fights felt a little bit to soon for it, but otherwise it was good. I also felt that the 2nd chapter map had a bit more in terms of atmosphere, I think it was because of the fog, but I'm not sure. Another thing that was strange was the transitions, in which the screen fades out, which is a bit disorienting at some times, but for the most part it worked well.
Overall, thought that was a excellent demo, and anticipate future updates as well, nicely done.
RandomUserMDB
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A Source modder, waiting for Source 2.