One Word: Scary.
Three Words: I. HATE. YOU! (Not really :p)
This was one of the scariest demos I ever played. And, oh God... why, oh WHY, did you have to put in a certain soundtrack that I absolutely hate (Because it is so scary, the scariest (or one of them) soundtrack EVER on a horror game). I don't know how to do the "Spoiler Below" thing so I can't tell you which one :/ but anyway... that certain soundtrack kept my goosebumps high and alert. It felt weird.
Haha, I honestly can say, I don't even know if I'll be able to play the whole custom story when it comes out, thats how scary I found it
Anyway, great custom story man. Keep it up