My review:
Music: First time I opened the game I got absolutely freaked by the audio to the point that I couldn't really go on. It was really excellent ambience. I've been gaming for many years but I'm not a massive fan of the horror genre so horror fans will find me a bit cowardly but I eventually pushed myself onwards.
Level design: The first level was good although there was some collisions and laggy spots (I'm running a high end computer). Overall though, it was pretty good, entites placed well etc.
Lighting: Personally thought it was far too dark. Although dark corners etc are good and all for enemies to sneak up on you, I found it really annoying that I had to walk into complete darkness backwards to see if I was actually hitting a wall or not. ;S I think you need to up the lighting a bit, nothing seemed solid which was especially noticable in level 2.
Enemies: The first enemy I encountered I couldn't see. No idea why, i was standing in the middle of a corridor getting hit constantly. I thought i was perhaps getting hit by projectiles, but eventually after I had died once I saw him in a side room. Overall enemy placement was good though.
Level 2: I never finished this level. I thought it was very much like the previous only much bigger. I found myself in vents quite often but becuase of the darkness of the rooms I didn't have a clue where I was going. The vents had bright lights in them and this was very much a relief. :s I got stuck on a round table, took me a minute to work myself off of it ^^. When I was on the gantries all i could see was black below me. I assumed you could perhaps walk along the bottom, but obviously found out that all that was down there was death. Mabye you could signpost it more clearly. Like, have a sign saying: "DANGER! Stay on walkway at all times."
Anyway. I think your lighting is your primary concern. Perhaps levels should be more story driven with triggered events etc to help you on your way. When I entered the second level I just got completely disorientated by the many different routes. And the fact that many of the rooms looked the same (They were all too dark) annoyed me a bit.
Sound: 10/10 - Brilliant!
Level Design: 7/10 - Just a little more variety would be nice!
Lighting: 6/10 - This would be bumped up to a much higher score if it were a little lighter.
Triggers/story: 6/10 - The computer screens were a nice touch, but for a 22 level game I think more story events would be nice.

Spartans! Ready your breakfast and eat hearty... For tonight, we dine in Hell!