A fantastic game with great survival mechanics and interesting story. Survival mode offers hundreds of hours of open-world gameplay and Wintermute provides 5 episodes (4 at the time of writing) of intriguing story and decent quests, which uncover the backstory of The Quiet Apocalypse and teach you important survival mechanics. Survival mode offers a range of difficulties or even an option to make your own, so you can adjust individual aspects of the game and make them as difficult as you want them to be.
The game is constantly evolving and receiving regular updates, featuring not only additional episodes of Wintermute, but also great improvements to survival gameplay. Recently, the game also started receiving some DLC content you can buy on top, which looks very promising so far.
If you're a fan of this genre, definitely try this one.