Oh, yeah. I played "better" games prior and since, but Subnautica was definitely my strongest experience, overall. I really think they nailed the balance of open world exploration and storytelling and also the balance of terror and wonder. When I played for the first time the caves and "underground" was always incredibly stressful, but returning back "home" to the shallows and Kelp forest was the best thing ever. I had a huge base with everything, including personal quarters, office, power delivery "sector" of the base was separate so I wouldn't be bothered by the hum of the reactors,...
It was a holiday resort.

And I loved just swimming around, playing with the Cuddlefish (of course

) but man whenever I needed to go "down there", be it to gather resources or push the story a little forward, it was terrifying.
I didn't play it on permadeath, though. Although I think I only ended up dying once during the first playthrough, well... it's still more than 0.