A very decent shooter.
I really liked the gameplay, it was very responsive and not laggy or anything. The whole lighting-thing was really nice, worked nicely and gave a nice boost to the creepy atmosphere. The sound effects were cool too, no complaints there.
Only two things bothered me:
First of all, the repetitiveness. There were 5 corridors and 5 halls, each of them were absolutely identical. That was pretty boring.
And second, "cut-scenes". Every line was filled with meaningless cliches and totally pointless crap. Seems like the script was written by a 12 year old.
Other than that, this was a very nice shooter, aboslutely above average.