If you're into achievements and passing time, this is a good game for you. There's not much story to it, and the overall missions are subpar and easy. However, with the addition of new maps, new weapons, and now a survival mode, this game is good value for the price. Think of it as a low budget Sims and GTA meets zombies.
The developers of this game really listen to you. Being in quarantine, I find myself with more time to develop my survivors and base. It's also fun when you just want to blow off some steam and kill zombies in spectacular fashion. I give this game an 8 out of 10. It's severely underrated and overlooked.