Awesome

Unlimited shields and lives:
When the cargo/energy screen appear, move the cursor to the top
left-hand corner with the joystick, then press fire and [keypad plus]
at the same time. The flasshing screen will confirm the correct code
entry.

Keys - Effects:
0-9 - Change weapons
F1 - Disable enemies
F6 - Restore energy

Jump to finale:
Activate cheat mode, then select the outermost planet to
jump to the end of the game.