Yes I know I'm exaggerating a bit here but it is true.
I told a friend to try the demo and he was unable to because it is missing:
graphics/entity/gate/wall-diode-green.png
This is in the live steam branch and on the website so I guess your automated building system messed somewhere up.
I was completely in disbelieve at first and yelled at him that it has to be his fault xD
However turned out to be true....
MAJOR CRISIS Demo is missing files
MAJOR CRISIS Demo is missing files
The strange German dude