The concept of the hack is creepy and all, but I feel as if the creator could have done more with actual content. Most of the horror factor comes from the image and the message blocks.
I like it like that, really... if it seemed like a horror hack, nobody would have expected what the message after the boss would say. Until then it was just odd and sorta lonely. The end surprise works great with the setup. But considering the Victim was only #1, perhaps the creator would have made more if the hack had been accepted to SMWHQ?
There is a second hack. He seems to have no memory of ever making his first one.
If you view the comments on the Creepypasta Wiki posting of it, it honestly makes it far more scary. Mainly because apparently this weird shit is involved.