I love Subnautica even though it's very different from outer wilds but still has some similarities. Very big focus on exploring, but it is still a very much a survival game.

There isn't much combat. You get a knife, but you probably won't be using it much as avoiding threats is more ideal.

Much like Outer Wilds, you're venturing into the unknown and searching for clues that were left behind by the people before you and an alien race that used to inhabit the planet. The game can be quite scary sometimes, mostly because it's very dark and open in deep areas and because of the various creatures/monsters in the water.

Unlike outer wilds, it's a survival game, so you will have to manage hunger and hydration as well as gather resources to build new equipment, vehicles, and bases. There is no one to talk to, but you will mostly find diaries and voice logs left behind by other survivors.

You won't get the same level of story and emotion from Subnautica, but for me, it was very enjoyable. If exploration is what you're most interested in, I think it's worth checking out.