The game is divided into open zones you can freely enter and explore, but there is a linear progression to the game. That means if you wander off into a biome you're not yet ready for, you will very quickly die and drop your equipment, which you then have to recover. If you stick to the biomes you're supposed to be in and explore everything they have to offer though, it is an easy game that doesn't put much pressure onto you.

Other than that the game is a bit grindy. I enjoy the atmosphere it has and the logistical mini problems the game presents you with through the grind, but if everything has to happen instantly for you that might be an aspect that could annoy you.

The game also has a very high emphasis on building. You don't have to do it, except for a simple main building you use to upgrade your things and store resources in, but then a big chunk of the content is wasted on you.

Lastly the game hasn't been properly updated in month now and apparently the devs buggered off into vacation or something? It's probably not yet abandonware, but if you expect a constant stream of updates and regular new content, this is not it.

That being said the content already in the game is worth the 20 or something bucks. It's well polished, plays well, has great atmosphere, nice music and is fun to play. And you can easily play it in co-op too.