The writing is occasionally in need of help - Sigfrid's face did NOT "turn into a question mark" as is suggested once. That phrasing left me snickering and thrown from the flow of the story. However, rarely does the writing detract from the story, and since that's my primary criteria for that category, I find it passable.
The setting of the story is a quiet strength - it is more well-developed than I would expect for a (free) novella, and it has enough depth to pique my interest.
The plot itself is not unique, but is interesting and, eventually, gripping - without giving away too many spoilers, there is some question of whether or not the presented reality is accurate. Sigfrid is described at one point as "not very stable", and it isn't quite clear whether the dragon is "calling" his beloved or Sigfrid himself. This adds quite a bit of tension and interest to an otherwise mundane plot, and should have been explored further. As it stands, I'm not entirely positive that uncertainty about Sigfrid's sanity was intentional, and so it leaves me a little confused.
The characters are a little flat, though I think that might be partially due to the heft of the concept compared to the length of the piece. None of the characters are particularly compelling, but I also didn't hate them. They are vehicles for the plot and could have been more interesting if this had been done as a novel instead of a novella.
The ending was abrupt but interesting. It left me a little frustrated - I wish it had had a more satisfying conclusion.
Knitting. I am a knitter, and always excited when there is a scene about knitting in a book. However, what in the world does Sigfrid mean when he says he "stricked" a pair of mittens? I cannot figure it out and have never heard that term before. Harumph.
All in all, this was an entertaining and quick read with some interesting aspects, but much of it was middle-of-the-road and somewhat cliche. The reality-questioning aspects could have been used to counterpoint the cliches, but are currently somewhat confusing as I'm not sure they were intentional. I would recommend this novella (especially at its current price of "free") and look forward to future novels from this author.
Note: This novella is a retelling of the German and Norse myth of the royal family of the Burgundians, which I didn't realize until after reading it. This adds some context and interest which wasn't present for me before knowing the original myth.