Good world-building! I enjoyed the history behind the development of the worlds. 
 The plot line was engaging, quite a few twists. 
 Asa was a good main character, even if she fit into the typical YA heroine mold. She was interesting to watch, and I enjoyed watching how she made the best of her circumstances. 
 Eagle was an engaging love interest, he was stoic and distant - defensive because the superficial people of his house had begun dismissing him because of his scarring. 
 I really enjoyed how it didn't matter to Asa, how she saw past it so easily and jumped to defend him. A cute romance as an addition to the story. 
 No wonder he smiles so rarely. Everyone would forget how to breathe.