The pair of small ships floating around will spawn new Bottrocks if you kill the two below you. To prevent a nonstop stream of these rude beasts, use sniper mode to smash the orbs on the bottom of the small ships. To disarm the huge, hovering alien ship use sniper mode to shoot the four orbs in the center of the ship. And in fact, if you don t sidestep you ll be dead in a hurry. Shwang will take you with extreme prejudice.
More mechanical arms open up and put out even heavier fire, so keep sidestepping to avoid the shots.
Another blue orb appears in the center of the ship shoot it several times to again disarm the alien craft. After you hit the orb you ll see the alien piloting the huge vessel. Now s the time to break out the Super Chain Gun that you ve been saving. Keep sidestepping and concentrate your fire on the Pilot. Even if the other two Bottrocks are still alive, just try to avoid them and hit the Pilot.