I thought this was a really interesting experience. I quite liked the story, the idea of celestial reincarnation of some sort, and how that played into real life concerns. The way you used Ren'Py was great as well, you found a way to fit the tone you were going for. The little star icon on the messages gave it a nice feel.
I think it could be longer, and I read both source poems and liked how you took the theme of being one with nature from The River and extended that to celestial existence. :)