Press Start on Controller Two when game begins and hold it until you get to the Weapon Select screen. Your energy will still go down but you won't die when you run out.
Fly to the warship without shooting any enemies on Level 1 and then destroy the warship at 52 miles or more from the base. You will have 2,800 points and no bonus weapons until you start the next level.
Press A + B + C to change your firing setup.