I challenge you to name an arcade game that doesn’t have an objective of scoring points or knocking out the other guy or just surviving as long as you can. And I see Garry’s Mod more like a deck of cards; the cards themselves aren’t a game, but what you do with them, the rules you make up about using them, especially with other people—it’s a game engine, a vehicle, not a game itself.
Anyway, Outer Wilds is one of my favorite games, partly due to the exploration and discovery of the story and mechanics, partly due to having my spaceship clip something at high speed and deciding to fly out and repair it while trying not to drift off into space or get inescapably close to the sun. None of which matters in a game where flying into the sun is an effective solution, but it’s heckin fun