Zombie Cannon Shot

A huge wave of zombies is coming. We just have a mount fortress to stop them. What you need to do is to control the shots to hit horrible zombies. Gameplay: --Use your finger to drag on screen. Control the strength and adjust the angle according to the guideline to shoot. --High scores and shells can be got when zombies are constantly hit. --Don't hit any obstacles, otherwise you will waste your shells. --Something like "double kill" "triple kill" may occur when you hit oil tank.