Various cheats
     At the Main menu type:

Cheat code:             Effect:
Lacrimosa               Level select
Karma                   Karma is a playable charater
Sophia                  Sophia is a playable Character

During play, pause the game and enter:

Cheat code:             Effect:
cachou                  Max everything
boz                     Full mana
xul                     Full life
alex                    50 lives
jbb                     Full weapon capacity
mumu                    Max experience
rik                     All spells

No collision detection: 
     Hold Ctrl+C+Z and move around without collision detection.