To prepare for wanting to run it at Kapcon, I ran a one-shot of Ganakagok last night.
The short version is that the game worked great, play ended up pretty much as the text implied it would. Perhaps more so, as the constant turning of cards to inspire narration kept giving us ideas in keeping with the setting.
The characters had perhaps a little weak construction (in terms of building Truth-vision, Change-hope and Change-fears that prompted immediate action), but the world building meant that as soon as play began stuff began to happen.
It turned out that we had a very small number of stars, so a short game. That was fine as we have a fairly short session anyhow (especially with all the preparation). The action fairly zipped along and the characters quickly fell into a love-triangle (square?) feud rather than attempting to deal with the coming changes.
Still, it gave us a good story and lots of fun alliance breaking and so on.
I suspect that the myth we made would be told by the descendants of the Nitu as the last sins committed under the old ways, before the new ways gave them a better way of life.