Enter these codes on the cheat menu. In the game the words shall be connected, I have spaced them for easier reading.

Unlock Doors. - ANY AND ALL CODE
Big Head. - BUTT CHEAT CAN SURPRISE
Restore Health. - CANE READY TO ROCK
Time Factor (Control The Speed Of Time). - CHARLIE ALPHA NOVEMBER ECHO
All Weapons. - CHARLIE HUSTLE OVERDRESSED ROMEO
Enemies Thwarted/Frozen (On Boss-Fights This Option Must Be On Thwarted). - CHARLIE OSCAR LIMA DELTA
Open All Levels. - COOL LEVEL CHEAT CODE
Big Feet. - DEAD RED PARTY SHOES
Unlimited Ammo. - FISH IN A BARREL
Weapons Level Up. - FRIENDLIEST GOD IN GALAXY
Message from the Developers - GOOD GOD HELP ME
God Mode. - NO PAIN NO CANE
Clear Map. - YESTERDAY YOUR ZEBRA DIED