Hi,
Tried this on my Xperia Z. I’d say a good concept, however I feel its a little bit slow-paced. Perhaps you can make it a bit fast-paced? and everytime I killed a zombie, I’ll get a some kind of cash to refill my turrets or to upgrade. I’d prefer for my turrets to auto-target and fire too XD, but perhaps that would be a lil bit generic I guess. Good luck and thanks!