I loved the plot to this story. You brought a unique perspective to shape-shifting and the fantasy world. I love post-apocalyptic type novels. I wish you would've expanded more on how the Earth changed and the causes of these changes. The idea of a mutation in genes after a dramatic shift in the environment of Earth is brilliant (I am a science nerd).
Read the story now
I also love the story being told from different character's points of view, which is similar to my novel. The only note I have on this is in some cases you repeated the same scene going from parker to lyric or vice versa. Maybe could have one of them thinking back to the conversation and surmising how they felt or what they were thinking in the moment? Just an idea.
As far as the technical part, I do feel there were many places missing comas to show pause, or you could even use and "Em dash," as well as a few other grammatical errors. These can easily be worked out!
Overall I loved the plot, the story, and the message. I was drawn to the characters and felt true emotion. You captured what it means to be in love very well. It's easy to feel love but very hard to convey it in words, but job well done. Last comment....I love how you ended the book! Sets it up perfectly for the next novel and leaves the reader on edge.