I really liked the plot and setting, and the story base was quite unique imo. I'll share some additional thoughts on the characters -
Ok, so I know that in these sorts of stories the simplistic sort of audience tends to hate and villainize characters like Siglind and Miltraud. But nobody wants to die, and for very good reason. Though they, especially the protag, were super dumb to not read the entire thing with caveats.
Also even in the 'good' ending, while Faralda is a nice person, she isn't really repaying Isgard for all she did. Instead of doing her best to find the witch or find a cure for Isgard using her obviously big influence on Odan, she is merely shown naming her kid after her true friend. Although maybe she did try to do so, and it just wasn't shown. And her finding the cure to ageing effects would've weakened the impact of the protag's choice.
Odan sucks, he's hot and good to his wife but clearly has no qualms bleeding the poor villagers dry until Faralda wins him over. But that's well in line with how many among the nobility used to behave.
In short, every character in this story is flawed and realistic. Nobody is a true hero or selfless.