OKAY, I need to step in for a second on Nether.
Nether is NOT made by the people who made Infection Vaccine Stories at all, they made the World War Z game based on the MOVIE on iOS.
And Nether isn't bad, I've played it for about three hours so far with a friend, and while more stuff does get updated and needs to be updated, I do like the systems it has in place. But think of it less as a straight-up survival game, it has more RPG elements than Day Z for example and feels more game-y. The environment, ability to explore a lot of buildings, and variety of monsters is fun and appreciated though, and surviving can definitely be tough.
I'll try and make a thorough video showing a more in-depth review of the game, but the developers have been kind and for some reason people have this weird misunderstanding that it is somehow connected to that OTHER game.