Part RTS, part tower defense, part zombie apocalypse. Never played anything quite like it but I do like the gameplay, it forces you to expand while fighting off wave after wave of a variety of increasingly difficult zombies. The controls are perfect for touchscreen. The main game type is basically horde mode and has you surviving as long as you can. It is somewhat limited though as there is a finite amount of resources you can collect but it has a good variety of challenges that keep me coming back.
The map starts out pitch black with the exception of your home base/building. You have to build (and defend) lights to push back the darkness because you can't build or fight in darkness. You must also expand since the few resources you have access to in the beginning eventually run out, forcing you to search the map for more. And you have to build your own power generators to run your little operation since the zombies took down the grid.
All in all I like it, it has a nice variety of achievements that I found myself working towards and it gets points for being unique. I don't care what people say, blowing up zombies is still fun