When fighting the boss, use the mouse to control your ship. It allows for fine maneuvering instead of the jerky movements that your keyboard gives you.
As soon as you have the Browning and Bazooka, it's too easy. Simply use the Browning on infantry and cannons and jeeps, and the Bazooka on the tank. What makes this all too easy: reloading a gun, while using a different one. 6.5/10 for me
 "Reactance"){kind=icon}
 "Give Up"){kind=icon}
 "Rebuild"){kind=icon}
 "Super Stacker 2"){kind=icon}
 "Box Clever Level Pack"){kind=icon}
 "Gravitee Wars"){kind=icon}
 "The Company of Myself"){kind=icon}
 "Palisade Guardian"){kind=icon}