Well let's face it, the "original" scirra ghost hunter demo isn't exactly an original concept, its been done loads of times before in games... and Clickteam did not make this demo. Sphax did- one person, on his own with the help of a graphics dude.
No, Sphax provided the pixel shaders, another person did the artwork and yet another person made the demo. Sphax submit it to TDC. Read the post again.
And yes, it is a copy of Ashley's demo ... not because of ghosts, shooting, effects ... none of that. It is because it looks almost identical to it.