For me, Subnautica is one of the best survival games ever. I like the story. Even after finishing the game, I always find new wrecks and new PDAs in each playthrough. These enrich the main and the side plots. Graphics are pretty and well optimized, so the game won't stutter even on a potato PC.

There is a whole lot to explore, so I never get bored with it. You'll find plenty of creatures and gadgets to craft. Some enemies are challenging (e.g., reaper leviathans, ghost leviathans and even sea dragons in the lava zone), so I don't find the game all too easy.

Have fun exploring in Subnautica! :)