Before everything, let's go to the point I heard a lot of people complaining : this game is long. Like, really long, for an era where a game of 10h is already considered like a lot. That said, I personally had nothing to say against it, probably because I didn't felt the time go by.

No, what I remember vividely is the constant fear I felted from the beginning (where I wasn't even aware that the Xenomorph wasn't there yet) until the very end. The sounds, in particular, were very intense. You could hear your breath becomes shorter, the Alien's footsteps at every turn, searching for you, and I was always afraid to start an audio tape to find out about the game's history, because I knew the Alien could hear it too and wouldn't think twice about coming after me.

The AI especially was a wonder - because even if you played the game in easy mode, the Xenomorph never stopped improving and adapting to your techniques, until the very end where he was basically knowing at every time where you were and how to stop you in your tracks, literally forcing me to run in a straight line, hoping to beat him in speed.

As an horror game, it is, still at this day, the best experience I had, even if I'm still a bit more mixed about the story in itself, since it basically contradicts that of the films - but, oh well, maybe I'm biased, but it's not as if Alien's creator himself still respected his own timeline ;P