Outer Wilds

If you’re a naturally curious person, the odds are you will probably enjoy Outer Wilds. No other game I’ve played has ever had quite the same blend of mystery, conquering the unknown, and semi-realistic space exploration.

Could someone make another game like it? Not impossible, I suppose, but I think you would be hard pressed.

Should you keep playing the original? You really can’t, one time through is all you get. Once you have discovered all the secrets and uncovered the mysteries, that is your journey through it. Still fun to visit every once in a while, though

The Chaos

Seconded! OP, in a similar vein as the world building games you already mentioned, you might find Intrepid interesting. I could see it being used to do world building + history of some of the major players and nations therein.

I could also imagine the relationship map it uses being hacked a bit to allow for some Disco Elysium style personality skills / thought cabinet shenanigans if you were interested in leaning into that in particular.