Have to add also that this game inspired me to buy the first two Alien films (which I've not watched in... donkey's years).
I've watched them back-to-back tonight, and I think I'd actually forgotten how brilliant they are in their different ways - tense, claustropbic horror in the first and perfectly pitched dark action film in the second. It's odd to think that whenever I was asked to list my top five films, Alien and Aliens never even registered as possibilities.
This game, though, has reignited my enthusiasm for the Alien films, and having watched them again it's increased my admiration for the game in terms of how much of the feel of the films it managed to carry off.
Have to say that at the moment I'm very much with those who've been lauding this as one of the top 10 or 20 games of all time.