Just found this:
1. Go to
http://www.o-kami.jp/
2. After the intro, click the bottom box in the main circle of links. It has an 8-bit pic of Amaterasu on it.
3. It should load Kamiki Village (first village in the game), but in ye-olde graphics.
4. Clicking on people and skipping past the japanese text should allow you to download 8-bit versions of the game's soundtrack!!! :D
I'm also 36+ hours into the game, and NOT CLOSE TO DONE YET
Granted, I did spent a few hours on sidequests, but whoa.