Hello, Orthoprax! Aww, I'm happy the game managed to leave us an impression on you. As for the answers to your questions...
1) The song at the end is Nightmare by the amazing Dekron & Eyedropper.
2) You certainly can write fanfiction for this! (Just as long as it doesn't promote any hateful messages.) If you decide to write one, please do let me know. I would be happy to read it.
Ah, I do believe the voting is over by not, but we really appreciate the support! I hope you'll continue to look forward to our other games. :)