For $9.99 (USD) you can pick up the PC version of Zombie Tycoon 2: Brainhov's Revenge.
Zombie Tycoon 2 combines zombies and real-time strategy to bring a lighthearted experience filled with humor and brains. Choose between two undead breeds: Would-be-emperor Orville's heavy-duty classic zombies or his mentor's fast and agile blue zombies. Rid the existence of humanity in Finkleville in Zombie Tycoon 2's campaign or continue the undead buffet in a multiplayer mode that will keep the living cadavers coming back for more!