Cheat menu:
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.

All upgrades:
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.

Invincibility:
Select the "Credits" option at the main menu, then press X, Z, R while watching it. The "Invincibility" cheat option will now be unlocked.

Cheat options:
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
Slo-motion
All upgrades
Permavision (Unlimited scan vision)
Instant Death
Invincibility
Deathstare (automatically kill anything targeted)