It does look good indeed! I'm about to try it on my Linux here (Debian based one).
Tried and it worked ... although, it was running at some 10 - 14 fps on Radeon HD 5470 (gonna try it at home on HD 6800). E.g. for effects it has rather poor performance.
Anyway atmosphere is good, very good (although sort of parallax mapping and noisy SSAO is tearing it somewhere). I would pre-bake indirect lighting also as it would look damn cool in this, pre bake into mesh. Travelling through corridors in demo is also too long (I was a bit boring during it) - of course if I would go through there in sort of dungeon I wouldn't be. Maybe a cut or two would make it much better (but that would me more like making a movie ofc).
All in all I like it! Keep up the good work.