I really like the concept and the world building from what's there (current free version on Patreon, not the version offered here).
This being said, a few cases of questionable English (first I have to get a gun to find out about the collar? Also Kallen saying she should, rather than shouldn't go to the bathhouse at night) and some people still speak Russian in the English version (e.g. purple-haired girl in the ork camp, second tent in the middle row; Ork guards at the southern gate as well).
I also with the initial talk with Catherine explained the options differently. I'm not going to support the orks raping her for discipline, but I could very well suggest that given the position she's in, being a little less aggressive when dealing with ork advances might be to her benefit... which to be clear, IS what Kallen ultimately tells Catherine (alongside the Orks saving Kallen's life), but the initial choice doesn't quite say this.
This being said, that's a detail, and of course, I don't know how much of this has already been addressed in the currently paywalled version, if extant.
Nevertheless, while not without issues, the world building is very much to my liking, and so is the overall plot insofar as it is currently recognisable.