This game is an INCREDIBLY good survival game (notice the emphasis on the "INCREDIBLY") and I would highly recommend it to anyone who likes/loves survival games. Also, the story for this game was both engaging and fun. Furthermore, the graphics/visuals/environments in this game are immaculate and so beautiful. Not to mention, it's progression system is REALLY good and can entice you to constantly want to build new vehicles/upgrades/tools/modify your equipment/upgrades. Plus, the amount of content this game has to offer is a profficient amount and I can assure you that you will not get bored even one bit whilst playing this game. I clocked in around 40 hours playing this game just to complete the story, along with everything else the game had to offer. I may have taken longer than usual, but that's how long I took. Do bare in mind though that I did spend just a little bit of time messing around in the game. Moreover, this game is very good at scaring it's players due to just purely how scary it is to travel to each biome and know that a Leviathan could just attack you at any moment, or you could be ambushed by any dangerous sea creature. Every second that you travel deeper and deeper into the depths of Subnautica, the game becomes more horror-like aswell.
These are the scores I'm going to give for every aspect of the game:
Story: 9/10
Gameplay: 9/10
Graphics/Visuals/Environments: 10/10
Progression System: 10/10
Longetivity: 10/10
Soundtrack/OST/Music: 10/10
Atmosphere: 10/10
Horror: 9/10
Overall score: 9.625/10