Very cool game! I was especially impressed about the textures on the walls and the nice sizzling effects you made!
The arm with the weapon was a nice element of control in the dark corridors (wish it could also light up the place when I was shooting!)
Very cool you communicated the changes in location with different textures. I also agree with people, I got lost many times. Had to use the classic "keep left and you will find an exit" labyrinth advice, but I assume there were branching paths or I missed a corner somewhere. Also, upon entering the other ship, i might have missteped somewhere and all the rooms turned dark. Had to restart, worked fine. Got the big orange crystal thing, found a raving lunatic behind a door, but then couldn't get to anything else of importance, managed to get back to my ship, but nothing I could get done. Also, was very scared of the enemies, kept shooting at them from miles away hehe. Have to say their deaths didn't quite fit the game style you've build with such realism and scary sfx. (But the did make me piss myself from fear when i kept seeing them around the corner).