I played through this because I recognized you from the Violence series! You have a really distinct writing style that's so immersive. I have a lot of feelings about this game, Nils especially, though I'm not sure if I'm phrasing any of this very well so I apologize in advance.
[ABANDON ALL HOPE, ALL YE WHO ENTER THE SPOILER ZONE]
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I wish we saw more of Nils, but I also think that keeping them somewhat shrouded in mystery helped them feel more inhuman. Much like Magda, we don't get much of a feel for their personality until the very end, and even then we're unsure. They're angry, rightfully so, but is this solving anything? Are we safe with them? Is this any better than the life we left burning? Whatever the answer is, it's not for the reader to know anymore. I found that really powerful, the ending was, like, satisfyingly unsatisfying if that makes any sense.
I took Magda's relationship with Nils as a kind of parallel to people who leave abusive families later getting into toxic relationships, but I might be misinterpreting. I don't think Nils is a bad person, I don't think human morality can apply to them given that they're not human, but I also don't think that Lilia is a healthy relationship. Both Nils and Magda have every reason to be angry, to hate and honestly it was cathartic to see them hurt the people who hurt them--but that's not where the story ends. Showing the aftermath, the second thoughts after a violent revenge was a such a cool narrative choice. I wish there was a bit more of it.
Sorry for rambling, I hope all that made sense and I didn't misinterpret too badly. I really love your games!