This is the game that dragged me kicking and screaming into the survival genre!
It is absolutely beautiful, and while the open world is daunting to begin with (partly to simulate the confusion of crash-landing on an alien planet), there is a surprisingly detailed storyline that keeps progressing through radio updates. This means that while you can just float around building your best underwater house, there is always a pointer to keep things moving along.
Best game I've played in a long time, and the detail and depth of the ecosystem that has been built is outstanding. You won't be disappointed :)