Cheats for the full version:

 Type [t] to open commandline:

 baddaboom           function unknown
 skillz              get skillpoints (only in level 3+4)
 build               show version On/Off
 maphole             skip level
 pos                 show position On/Off
 poltergeist         Invisibility On/Off
 health              full health
 armor               full armor
 god                 invulnerability On/Off
 guns                all weapons
 ammo                get ammo
 kfa                 all guns, ammo and full health
 mods                all gun modifications
 nextmission         next chapter
 rosebud             create snowtruck


 and then type [ENTER] to confirm.

 ---

 Cheats for the demo version:

 Type [t] to open commandline:

 baddaboom           function unknown
 skillz              get skillpoints (only in level 3+4)
 build               show version On/Off
 maphole             skip level
 pos                 show position On/Off
 poltergeist         Invisibility On/Off
 health              full health
 armor               full armor
 god                 invulnerability On/Off

 and then type [ENTER] to confirm.

 By ByteBuszta, ByteBuszta@icecheat.de