There is no way to easily shoot ALL of the credits. Your best bet is to just rapidly shoot
as many things as you can.

GET A TURBO CONTROLLER!!! PRESS AND HOLD THE TURBO BUTTON AND PRESS A WHILE HOLDING THE
TURBO BUTTON. THE A BUTTON WILL GO 2X FASTER!!! SO THEN HOLD THE A BUTTON IT WILL
REPEADTEDLEY SHOOT!!! IT REALLY WORKS!! IVE TRIED!! MY BEST SCORE IS 148. SO IT RELIES ON
YOUR MONEY AND FAST ANALOG FINGER!! (YOU CAN GET A TURBO CONTROLLER AT GAMESTOP BY THE
ESPLANADE.) THE TURBO BUTTON IS ON THE TOP LEFT THAT LOOKS LIKE THE Z BUTTON.

press B to stop the screen then press it again to unstop it hope it helps dudes