I am not very familiar with the story Goose Girl that this was based on but I liked the characters of Ava and Gun as well as the Empress (Guns mother). I didn't like a lot of the other characters as this story had a lot of villains and dark elements in it but I look forward to reading the next book in this series and what happens with Ava's sister Bianca.
Series Character and Story Connections for Fly: Goose Girl Retold (Romance a Medieval Fairytale, #3)
The story of Yun and Ava's son is in Dance: Cinderella Retold (Book 02)
Bianca's story at the Summer Palace is in Revel: Twelve Dancing Princesses Retold (Book 04)