We need more games like this!
The entire atmosphere (sound, visuals, fact that you have no weapon to fight back with) turns out to be an amazing idea. If you're into this genre of game then put on some headphones (or crank up surround sound), shut off the lights in the room and let yourself get immersed into this one. The only reason I can think of that you would be sorry for doing so is that you may take a quick break to check the time and realize you have to be at work/school in 45 minutes and never bothered sleeping. I'd rate this 11 if I could.
It seems my review was too short so here are some more characters.
Oh! One of the best things about this game is the suspense. So far there is not constant monsters jumping out at you suddenly like in Doom 3. This game puts visuals and sounds all over that just leave you on the edge of your seat knowing that something is going to happen, but when?