Head to the in-game cheats menu and insert the codes listed below for the corresponding result.

BOTOFMYSTERY - Wall-E wears goggles
BOTOFWAR - Brutally kill all in range
EXPLOSIVEWORLD - All regular cubes become explosive
GLOWINTHEDARK - Dark areas become lit-up
GOLDENTRACKS - Tracks are made of gold
RAINBOWBLASTER - Lasers cycle colors
STEALTHARMOR - Enemies can't see you