Press Esc for the menu and type:

LIFE	Full life force
MAGIC	Full magic
FULL	Full life, magic and clovers
GOLD	50 coins
SPEED	Change the frame rate
CLOVER	Gives you clover
BOX	Gives you the clover box
PINGOUIN	Gives you the Meca-Penguin
 
Infinite everything	Hold Shift and type 'TWINSEN'S BACK'.