Holly and the Heart Thief

My first fully fledged fantasy novel with a completely new world and laws of nature. Please let me know if its believable or false or concepts pushed in anyway. I want the world to flow and to be and exciting, mysterious, interesting etc. Some of the things in this book are a little dark and mature at times but I'm more of a show don't tell tell me if anything is too raw or not raw enough. Let me know what you think of my writing, my characters, plot and setting. All comments, rates anything is greatly appreciated! :)