I read it with my niece to whom I gave the book for Christmas. It's basically two different stories with almost no connection to each other, the first story doesn't really have a proper conclusion or clear moral so it gave weird vibes. My niece was super excited about the white woff but it appears for like one page, which felt pretty bad. We never read any other Hilda story and sometimes it felt like we were missing some information but nothing major. She enjoyed the story but it felt pretty underwhelming for me. The final message was nice. On the other hand, besides the stuff I already mentioned, the first part involved two groups of people caught in a loop of fighting each other, there is also a battle scene with people chopping off each other's heads. Even one of the main heroes gets his head cut off, which was definitely way out of line.
Finally, the Czech edition keeps the ad on the cover about the tie-in to the Netflix series, even though it's not on the Czech version so that was a dick move.