Type the following codes at the places noted:

On the copywrite load-up screen:
rush : gives you silly ships

Anywhere in menus:
xteam : gives you a piranha ship.
xclass : gives you phantom class.
xtrack : track cheat.

Anywhere in game:
psyrapid : mini-gun
psyprotect : infinite energy shield.
psymega : infinite weapons
psyticker : infinite time.