Great game, good enough difficulty. Should be added the ability to zoom out map so I don't have to awkwardly move around the pointer to reach the enemy.
4 guns, 4 missiles, 2 speed panels, 1 magnet, 1 lightning, upgrade everything and all you have to do is hold spacebar and you'll still win on the 20th wave.
 "Airborne Wars"){kind=icon}
 "UPGRADE COMPLETE!"){kind=icon}