I want to start off by saying that I really enjoyed this book!
I would never think to mix the supernatural with magic, but I think the author did so in a balanced and cohesive way. 
The whole story reads like a fairytale, which makes it easy to read and digest despite the heavier themes still keeping you on your toes. 

I didn’t read this book because it was marketed as a Rapunzel retelling, and I wouldn’t recommend anyone do that. 
There are themes and plot points in common with the Rapunzel story, but at the end of the day this book isn’t a retelling. 
It should be read as its own story without a retelling expectation, and appreciated as it is.