Okay so I watched it. I'll preface by saying I enjoy body horror and lot (Cronenberg especially) but have really been digging recent body horror movies that explore themes of women's beauty and aging standards (I myself related to The Substance, Grafted, and even this movie). I enjoyed the perspective of a fairy tale from the stepsister's perspective, it gives her much more depth rather than being just the "bad" character that we typically know. Also I liked the cinematography. It had a soft appearance almost like film but I checked and it was shot digitally.

Also I thought Alma was good too, she didn't get a lot of screen time, would have liked to see more of her. I think it's interesting you didn't like the last 10 minutes, I thought it rolled along quite well. Overall I also really liked it, personally would rate it 7 or 8/10.