I have to say, I thoroughly enjoyed it. The jokes were varied and generally landed pretty well, some of the deaths were gnarly, and it combined the comedy and horror aspects nicely. Would watch again at some unspecified date far in the future.
Honestly, I think that while Alien is conceptually a good horror movie in how it was written and shot, the way that xenomorphs have permeated pop culture make the original not fuckin' scary at all. No amount of suspense is really gonna make you THAT worried about something you've seen before to the point of making jokes about it. The effects were great for what was... the 70s, where it was competing with like, roughly contemporary Star Wars and stuff. It's just the kind of thing that doesn't hold up in its effect if you don't see the original before absorbing it in other media.
Definitely pretty gross expecting a kid when first watching that movie, though. That'd be gnarly.