Just finished
https://store.steampowered.com/app/264710 Subnautica. Exploran', gatherin', base-buildan', upgrades. Very atmospheric, there's places where I got spooked with the deep underwater, glowing, and giant fucking fish trying to eat my minisub.
The Unity3D engine it uses depends on the video card too much for collision-detection, so there were bugs, but still worth playing. Only true game-breaker was when I left a vehicle parked, saved the game, reloaded, and the vehicle was now parked underground. I used console commands to teleport under the surface, enter the vehicle, and swim out of the ground back into the water.
There's a story too, and it's very chill about it. A couple timed events in the early game are easy to accommodate, the rest is at your own pace, keep swimming and stop to look at the coral, or build a long tunnel in your base.