After multiple updates this game has turned out to be decently alright, however the story is extremely short, which is a big negative. The graphics are a little better than the original, but its pretty much the same thing.
I did like that they added much more modifications towards your base compared to the first game. So if you love building bases, i would say that its more enjoyable to do in Subnautica: Below zero.

If you did enjoy the first game, i would recommend this game aswell.
Before you buy it just know that, when i mean that the story is short, it really is, and its not very interesting either. You might have a completely diffrent opinion, but this is mine.