Select the "Credits" option at the main menu, then press [X], [Z], [Y] while watching it. This will enable level selection and the remaining cheat codes. Begin a game, then save your profile. Then, use one of the following cheat codes on that profile.
Select the "Credits" option at the main menu, then press [X], [Y], [L] while watching it. The "All upgrades" cheat option will now be unlocked.
The cheat options are unlocked for every 10,000 points scored in the game. Complete the game to unlock all of the following cheat options.
Concept Art 1
SGT. Candy Movie
Concept Art 2
Concept Art 3
Permavision (Unlimited scan vision)
Deathstare (automatically kill anything targeted)