Lots of fun
It gives of a Dead Space vibe, I don't know if that was what you were going for exactly, but it does with the extraterrestrials on a condemned space hulk somewhere and the the email, side story pick-ups.
It was a lot of fun, a great game and an interesting story, but what kept me from sticking this at 10 was that on the last security door on level 3, I believe, I glitched into a wall and couldn't fix it. I could still shoot at the monsters, and move (but only within the bounds of the wall). Maybe you could look into that?