I love the main character, the writing, the queer perspectives, and the examination of female friendship that goes beyond friendship.  I'm always a fan of people who are fish, or think they are fish or merpeople who want to be human, or merpeople onland, or anything similar.  What I had a little trouble with is the idea that she's a mentally ill girl, and she's going to have permanent disability. I don't think that's what I'm supposed to take away from this or that I'm even necessarily right about the conclusion of the book.  

From a storytelling perspective, the friend/girlfriend's letters detracted from the depth of the story and its momentum.