Gunshots in the barren hills

This is a third-person 3D shooting game, divided into easy, normal, hell three modes.
Hell mode is hard, you should start with easy.
Upgrading your defense is the first thing to do. The enemy is a little too much.
Recommended to buy the necessary number of robots, they are your good help.
Green, blue and red, respectively, indicate the strength of the enemy, from weak to strong.
First to attack the green camp, while earning gold coins, while improving their own strength. Otherwise, we do not beat the blue camp and the red camp.
Click on the battle and you can view the map, showing the distribution of enemies and your grades.
With each enemy camp you complete an attack, you can manually start the final battle, and all enemies will attack you together.