I originally had this on my wishlist planning to buy it when it went on sale, but as the actual release date came up I found myself actually wanting to play it, so I got it, like, three days early because I'd heard the release date was the 9th and didn't realize that was for the PS4 only.
It's pretty much what I expected, which is a good thing I think. n.n( performance is okay on my machine at least... )
Aimless exploration seems to be the main activity, of course. Every planet has scattered monoliths that teach you alien language and outposts with random events (usually, multiple-choice quizzes in an alien language that give you a blueprint for something if you get it right), and then lots and lots of wilderness. Scattered treasure hordes. Giant mineral outcroppings. Alien life forms that are usually peaceful but there was this one planet (I named it 'FakeLake' because it had these blue patches of dirt that I thought was open water from orbit) where all the animals wanted to eat you and it was SO ANNOYING because they'd dodge and were hard to hit and then the sentinels would come in to protect the poor, precious flesh-eating monstrosities and...
...I probably should have just left that planet right away, honestly.
So, yeah. The different planets seem different -- some have water, some have caves, some have cliffs everywhere, some have flesh-eating monstrosities, most of them are toxic or radioactive or boiling hot...
But they're so big! And there's no way to get a hint as to how to get back to somewhere that you left behind. If you launch from a planet and fly around in space for a while and then go back to the planet, the odds of finding that outpost with the shop that lets you sell your loot are... not good. I wasn't able to do it, anyway.
So, yeah. It's fun, as long as you like aimless wandering and looting tiny 'dungeons' and mining. And occasionally running away from flesh-eating monstrosities.