Various Cheats:
To access the following cheats, go to Extras, then Cheats, then...
Unlimited Shields:
Enter Triangle, Triangle, Square, Square, Square.
Unlock Animal Ships:
Enter Triangle, Circle, Circle, Triangle, X.
Unlock Retro Ships:
Enter X, Circle, Triangle, Square, X.
Unlock All Features:
Enter X, Triangle, Circle, Triangle, Circle.
Unlimited Ammo:
Enter Triangle, Circle, X, Circle, Square.
Super Fast Ships:
Enter Square, X, X, X, Triangle
Mini Ships:
Enter Circle, Square, Square, X, Circle
Infinite Cannons:
Enter Circle, X, Triangle, Circle, Triangle