have some fun with editing textures thats what iv done and open the file config.txt and put debug on to one then you can do cool stuff like
press I to blow uo near by heads
press ~ an type in power what every number you want or speed the same
also press ~ and type wolfieisgod and you will turn into a wolf

also i beat it and it's hard there also making a second one called overgrowth

and heres a new campaign http://forums.wolfire.com/viewtopic.php?f=7&t=1066

and another http://forums.wolfire.com/viewtopic.php?f=7&t=3797