A free program for Android, by HIGAME Global.

Zombie Defense: City Survivor is a real-time strategy (RTS) game where you play as a commander who will lead a small army of heroes to defend the city from hordes of zombies. The gameplay is based on creating a defense line and defeating the waves of zombies that come your way. 

The defense line can be drawn in a variety of ways. You can also choose to draw a specific area, or just draw the whole map. You will be able to use the map to move your army of heroes and create the defense line. The waves of zombies will come your way and you will have to defeat them in battle.