Recs.
Updated
SpecsUpdate
Pros
Pro Great theme and looks
The game takes place underwater, and with that it looks quite good for an underwater game. Looking up at the sun through the ocean looks pleasant and real. Coral reefs have multiple colors and look real as well. Graphics wise this game looks great and pulls off its theme of an underwater survival quite well.
Pro No pointless multiplayer
Not every damn thing needs multiplayer, and multiplayer can often ruin an otherwise incredible experience. There's none to be found here, and that intensifies the lonely atmosphere. Also, the creators didn't waste resources on something that would fundamentally undermine the experience so they could focus on making the game the wonderful thing that it is.
Pro The sound effects really set up the overall atmosphere
The sound design in Subnautica is amazing. Even though the soundtrack can be bland at times, the sound effects for the ocean noises are incredibly atmospheric and really help to get the player in the mood for exploring a vast, alien ocean.