Hi, I appreciate the honesty of this post-mortem a lot! I had a similar feeling about the waning toxicity of this story... Fluffy happy endings are lovely, but they can feel a little hollow. I too would've loved to see it be a little murkier, a little less of an unambiguously happy ending, but it was still a very enjoyable work in the end.
Also, as someone on the predatory/dominant end of the high trauma broken girl scale, I did super super appreciate Mill feeling like a real character with internal agency and desires instead of the oh-so-common dommy mommy kink dispenser! She felt very grounded and real, though I would've loved to see her get to fulfil her more violent desires - fair enough that it didn't end up making the deadline tho haha. Good story overall, and the vibe established with the various artistic elements was fantastic!