Cheat Menu:
At the Main Menu, highlight Options and press Left, Right, Left, Right. Now at the end of the Options list there should be a cheat option.
GameShark Codes
Infinite Pulsar8008628c 8000
Infinite Mug800862d6 0507
Infinite MFRL and Graviton800862dc 2a01
Infinite Purge800862de 0009
Infinite Solaris Missiles800862d8 0009
Infinite Shields80086284 1000
Infinite Hull80086286 1000
Thanks to Revolution readers Jon Muir, Froggy, Karl, Sean Walusko, and phikapx!