This was a game I voted for back when it was on Greenlight as I enjoy the idea of management sims set in the apocalypse but this one has a interesting twist where the apocalypse in this situation is one involving demons emerging from the earth. Not to mention the endings are different, depending on the two choices you get with how to save the world.

The only thing that gets annoying is as times goes on your base gets larger and larger attacks by enemies who find your base, even if you go into a sandbox mode at the end of the game they keep appearing so it's a little annoying if you're after achievements or something.

It's a difficult game to recommend as it doesn't fall into a single catagory and it's not something for everyone, but it's been very enjoyable for myself and I've not experienced any bugs at all.