Found a promising vidya: Colony Ship - A Post-Earth Role Playing Game.
Very much Fallout 1-2 like. It's a fresh release, according to Steam it came out this November, while was available as early access since 2021 April. It's still buggy. Hopefully they'll fix these. They'll probably add DLCs as so fashionable.
It plays on a colony ship heading for Proxima Centaury. Or perhaps it isn't heading there anymore. I'm too early in the game to be privy such secrets, if the player will get any info about that at all. But they were heading for it when they launched the space ship, with the goal of colonizing the habitable planet. The ship had seen a mutiny, which threw its society into turmoil. So now the people are divided into smaller groups, and noone tending the ship but some mutated dudes and gals because there was some accident and high radiation and whatnot.
The hero seems to be a nobody, from The Pit, from the bowel of the spacecraft, where there is a relative freedom. People live there from scavenging the old tech, some of it noone knows how to use anymore.
Not sure what the goal is, just doing errands for others it seems, which makes the player discover other regions of the ship, other people.