Cheatcodes:

Enter during game:

ETGOD -- God mode on/off. 
ETSTUFF -- You get all things. 
ETFLY -- You get wings, Fly mode on/aff. 
ETWIN -- Finishes the level. 
ETDRONE -- Battledrone/Upgrade. 
ETSCAN -- Display map on/off. 
ETALIEN -- Play as Alien. 
ETRESTART -- Restart on the current level. 
ETRAIN -- Play in rainy-weather. 
ETMAPS -- Check user maps menu. 
ETCAT -- A cat runs by. 
ETPULL -- Throws a cat. 
ETBOOM -- Dead...........