Sci-fi survival horror one-shot

Hey, all. I have a need for gaming that I'd like to scratch, and you seem like just the folks I'd like to play with. To that end, I have an idea for a survival horror game set in a science fiction setting I've been working on. I think I can run the game in one sitting, and since there seems to be demand for one-shots, I figured I'd give that a try.

As for myself, I'm a GM with roughly 15 years of experience across multiple systems, many of them homebrew. I haven't run a full horror game before, but I've used horror elements in other games and my players have generally responded positively, so I think I can do a good job.

The game would be set in a relatively-new (2-3 years old) colony on a recently discovered earthlike planet, with abundant plant and animal life but nothing intelligent in the native ecosystem. The players would play civilian members of the colony, potentially including security and administrative roles but excluding active military (which has only a token presence in the colony). Without going into detail, things will take a turn for the worse, and the player characters will have to figure out how to cope.

Looking for 3-6 players. Let me know if you want in, or if you have questions.

I'm always interested in one-shots, and I have a soft spot for Sci-Fi horror It depends on the day and time, though, as I live in Europe.