They are Billions is a very well made game! I like it. And it's actually a refreshingly colorful game.
The tower defense element (thousands of zombies spawning and storming your settlement) makes it a pretty punishing game: you try to frantically build out your settlement while protecting it from early waves for about two hours before the inevitable overwhelming final wave comes. You don't know until the very end whether you are doing OK or not.
The tower defense element (thousands of zombies spawning and storming your settlement) makes it a pretty punishing game: you try to frantically build out your settlement while protecting it from early waves for about two hours before the inevitable overwhelming final wave comes. You don't know until the very end whether you are doing OK or not.