I liked the overall ambience of the game. The enemies gave me nice space zombie vides á la Dead space or system shock.
Some feedback:
A bit frustrating when you accidentally lock yourself into a corner when the enemies explode/turn into a pillar in an unexpected place. It would have been nice to have some way of restarting the current level so you don't have to reload the game (or wait for it to time out?) when you get stuck
I never really figured out how to open up the path to the next level, some times it was open and sometimes not.