Ok. Binged Fallout. Never played the game.
But it’s basically Silo, if Silo didn’t take itself seriously, and also there’s no nuclear war in Silo, and everybody outside is dead in Silo (humans anyway, the rest of the ecosystem is fine as long as it stays away from Fulton County, Georgia).
And Silo is set in our future, not some 1950s retro future.
But other than that, same idea. I guess Silo was influenced by the game. It’s very much “what if Fallout, but hard sci-fi?”