The legendary soldier is incredible. In the game, the city has been attacked by aliens. They are trying to destroy the city. Now, pick up weapon and fight against them! Grab coins after you eliminated an alien to buy advanced weapons, towers and power-ups. You might want to invest in robo-factories and mana that supports you.
Keep an eye on your ammo. Tap or click on the reload button (or key R) to keep on shooting. Use mines and bombs. Upgrade your weapon in the shop.