You control the cannon. Shoot down enemy. Hold out in battle for a given time.
You control the cannon. You need to hold out in the battle for the allotted time to move to the next level. Enemy planes will drop tank spare parts. Do not let the tank be assembled entirely, otherwise it will attack your gun from the ground.
In this game there is a tower defense, and an air combat simulator, and military aircraft, air combat. There is also a tank strike. Tank battle will be if you allow enemy planes to drop an enemy tank on parachutes for spare parts. Then he will fire at your tower. Protect, defend your tower.