You better hit your evil opposition with the first shot, because he will not wait to shoot at you then. By having a few hits in row you will earn a protective shield which will last at least one hit.
Tap or click and hold until the ideal angle is reached to launch a rocket towards the bad guy on the other side on a tower.
How to play? Aim by touch and hold and shoot by release. Every 150 earned points you can buy a new character in the shop.