Quoted from SLAMT1LT:This is clearly not based on the movies but a new adventure set in the same universe. Video games create new stories and characters set within familiar world's, so it's not always necessary to carbon copy a film for a pinball experience. My first idea for Alien when Andrew asked me was a new story with new characters which I thought would've been interesting and different: Weyland Yutani hire Space mercenaries to capture and return a live xenomorh offering a tastey $200m reward. 5 ships go out hunting and the game follows one ship and it's crew, The Odysseus. What Stern come up with for JP2...who knows.
It is funny because the best video games are original stories set in that universe, not the "play the movie" licensed trash. (Batman Arkham, Lord of the Rings shadow of war, Star Wars KOTOR)