Really like this one from the moment it started.
Took a bit to get round the controls - not obvious about using the mouse with the keys.
But it looks amazing. I really liked the look down the corridors into the dark with the lights - very cool.
I also liked the way the computer shut the doors.
There is a nice Alien vibe going on here which could easily be added with some nasty beasties hiding round corners etc.
Loved it :)