I enjoyed reading this at first. I found the idea intriguing and thanks to the short chapters, it was easy to read. However, it felt more and more repetetive the longer the story went on. There wasn't much progress in the story and I couldn't relate to Nora - even though we get to know her past and relationships, she didn't feel very "tangible". Maybe it was because Nora switched between so many lives, but none of the characters felt "real", more like actors playing different roles in different versions of the same play.
As someone struggling with mental health, the whole plot was rather depressing than inspiring or hopeful. I interpreteted her experienced in those different lives as "No matter what you do, no matter which changes happen in your life, you won't be happy", which is proably not the message the authour intented. 
It was also kind of predictable how the story ends. And especially the end was disappointing. It was an easy way out, and

the way her depression was magically "cured" through that mindset shift

didn't sit right with me.