Empire Z is Ember Entertainments latest entry into the zombie genre. Despite the splash screen showing a group of zombies attacking four heavily armed heroes perched atop a taxi, Empire Z plays as a standard mobile city builder / strategy game and has little to do with zombies.
The idea of zombies could have made a very interesting strategy game. A severe lack of resources, risking the people and equipment you have to go forage for needed supplies, having to sacrifice any of your soldiers who were bit or risk everyone turning into zombies. But alas, despite the different art this plays like your cookie cutter OSG, rather set in space or antiquity.