This is so incredibly creative - your theme is excellent. It's also an interesting departure from other games (in that it's diceless and more of a collaborative storytelling game).
In terms of criticism, I think this kind of game will be very dependent on your taste; we don't see much opportunity for inter-character roleplay, just addition from each player to the joint story. There's no guidelines on numbers of players or how many poetry sets you'll need to play, and I think until we tried it in play we might not feel like there's much closure because in every end you will always succeed in writing a story. But again, I think these crits are more due to personal taste/reaction to the style of game rather than there being anything non-functional about the game itself. Still very much admire your creativity however!
(Adam & Grace)