@RideyrDnD You can everything with #travellerrpg. I would recommend the @MongoosePub 2nd edition but you hit up drive through for the original rules which are good as is for like $5 and have everything you need.
@RideyrDnD I believe Alien has their own system 👀 Could be transferred to something more of your style? alien-rpg.com
@RideyrDnD I have a few suggestions. drivethrurpg.com/m/product/3771…
@RideyrDnD I've played Traveller since October 1977. One of my early GM's kit bashed it with the Cthulhu Mythos and other Lovecraftian elements. Then again, there is Call of Cthulhu.
@RideyrDnD Would love to introduce you to the #reborninpowerrpg! I based it off of FFG Star Wars & 5e but added a lot of my own content that mixes Mass Effect, Star Trek, and more of my favorite science fantasy works. arthadiananthologies.com/post/chosen-cr…
@RideyrDnD Of course there's the ALIEN RPG. There's also Star Trek Adventures by @Modiphius. Veil of the Void by @PublishersSdg is def more sci-fantasy, but I know from experience you can run gritty scifi horror with it. Mothership is basically a scaled back legally distinct ALIEN game.
@RideyrDnD Eclipse Phase fits your description I think...