I found I really identified with Rose. In some ways, Rose was the ghost, trying to be as invisible as she could be and live in the past with her brother. I suppose in a way, grief can do that to us, keep us in a time loop and keep us from moving on.
I also appreciate the plethora of nerd culture references. The romance in the book was also cute. The one flaw? She let go of the breath she didn‘t know she was holding a total of three times.