Yes it’s a zombie game. With third person shooting. With base building. For those that have never played (or even heard of) this game on Xbox Live Arcade, the zombie shooter/simulator/survival/basebuilder is for those who want a bit more to play with than the average undead shooting gallery.
As an open world game, State of Decay allows you to set a home base and rescue/recruit survivors to help secure a location while scavenging the world for gear and essentials. Base customization allows such things as walls, guard towers, medical stations, and even small gardens to grow your own food.
Sadly, the port only supports an Xbox 360 gamepad at the moment; KB/M will come later. Priced at $20.