Alien is my Achilles' heel. I was upset with myself for not reading this adventure earlier because I missed the opportunity to organize a themed weekend after rewatching the movie!
The rooms are very well described, to the point where I actually think they might have too much description. It's certainly a matter of taste and style, but at certain points, I think you could be more concise. For example: "You can find the detailed description of all special items in the appendix" could easily be replaced with "see more in appendix p. 16" or simply "(appendix, p. 16)." That said, I really enjoyed this. The use of map snippets accompanying the descriptions is excellent and will certainly be a big help during the game session (and it's something I'm excited to implement in my own adventure after the game jam ends).