"We are being attacked by clone soldiers! Keep them from destroying our defenses for as long as you can."
This is a nice take on the classic game paratrooper, where the enemy endlessly drop in from above and try to overrun your base. Blast them away first! Hit their parachutes to make them fall from the sky and land on other soldiers. Be careful that they don't stack-up too high, as once you've got 3 soldiers together they fire rockets that do considerable damage to your base.
Hit the helicopters and planes to collect the power-ups which will increase your firing rate, give you faster bullets, repair your base, or make your bullets more lethal. Survive all 10 levels and win the game.