No.
Alien (not Aliens, which was directed by James Cameron) redefined the sci-fi genre. Aside from inspiring dozens of tributes, clones, and other knockoffs, Alien forever changed how movies depicted "the little green man from outer space."
Alien also revived the concept of a strong female lead in an action movie with Sigourney Weaver's character. Horror movies had, from time to time, had the one cute chick who managed to survive/outwit the psychopath (Halloween, for example). But these characters were otherwise the same "defenseless woman" seen in most every other action/adventure film. Weaver survives The Alien not because she is lucky or cute, but because she is tough, from the start of the film to the very end. Her action heroine status would grow in the sequels, of course. But it was Scott's film that started it.
Finally, Alien is just a tight, tight film. Scott is able to make a genuinely scary movie with a minimum of splatter. The "chest-bursting" scene aside, there is very little gore in Alien. Most of the action is off camera or only seen in brief glimpses. Scott understood that our own imaginations our scarier than buckets of fake blood. The tension between the crew and The Alien, and amongst themselves, is familiar and believable, which allows the characters to connect with the audience.
-Theo
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