That was fast. I wanted to solve the puzzle first for once but I guess I was too slow. ;_;
I really enjoyed the story. Actually I was just preparing stuff for my presentation about Creepypastas and so I had to read quite a lot of short horror stories. I'm not quite sure if this can be considered a Creepypasta, otherwise I would have read this one as an example in the presentation, but it's pretty similar regarding length and the creepy theme.
Well done, like always!