very much gives me the impression that this is a first time author. I had hoped this would be more extensive, but if you have a little bit of prior knowledge about non-binary identities there's not much new here.
things were at times oddly sourced, repetitive and there were a lot of statements I'm not sure I agree with: Gender expression is something that is not often spoken about when it comes to gender identity. That's not true in my experience, and it reads like a statement from someone who hasn't read a lot of queer literature. 
an easy read, and might be a good intro for a younger reader