As much as I love new versions of old stories, this one was a miss for me. That technology provides the basis for a new mythos, new goddesses, and new monsters is perfectly fine with me, although it definitely comes with some caveats. I assume that Gunther's "troll"-ness isn't a statement that he's a troll, biomythologically, but instead, his particular brand of lone-mountain-man-wanderer-and-occasional-cannibal has been branded as "trolls" the same way ancient peoples have been branded "the Coffin People" and "the Strange People". I also assume that the burning of Gunther's memories to banish Europa isn't banishing a connection. It's banishing evidence. Europa's entry into Svea's jurisdiction is exactly that, a conflict between law-enforcement officials over who should be in charge: does it matter where the criminal is, or just who it is?
My main qualm is with minor details. I certainly agree with others that the characterization of Linnaea is immature, but she's a child, she's allowed to have a favourite toy or friend who means more to her than any of her other playthings. But why was she sent out at all? The implication at the start of the story is that she's being sent away for her own protection, and I assume that what she needs protecting from is Europa. But if Linnaea's mother had the Dala Horse, and the Dala Horse is Svea, and the mother knew that the Dala Horse was capable of protecting Linnaea, why didn't she ask the Dala Horse to protect her back home... and protect everyone else?