This one really threw me off. I thought, frankly, the protagonist was mentally ill, and the way she viewed her husband was incredibly creepy. There was no attempt at all to communicate with her husband and talk about the changes he was going thru with him, instead she considers him a dead manikin impostor of her real husband, and counts his teeth at night after he falls asleep as a way of measuring his humanity. There's no sense of any connection between the two. And there's no reason any of this was her husband's fault; he was dying, and now that he's received life-saving surgery that's transformed his body, the narrator finds her husband unbearable but doesn't leave him. Instead, she has a child with him, and doesn't seem to be the least bit grateful that medical technology has allowed this to happen. At one point, she implicitly fantasizes about pushing him overboard into the middle of the ocean in front of their daughter to get rid of him, neverminding the torture he would suffer at the bottom of the sea.
There's no sense of bittersweet here, that altho she's losing her husband's original body, he still is alive and they're able to have kids together. Instead, she views him as an imitation monster. I think the audience was supposed to sympathize with the protagonist, but I'm not sure. I definitely did not. And that's fine, I've enjoyed many stories with unlikable protagonists before, but there was always something else to draw me into the story. I wasn't sure what I was supposed to latch onto here to keep me from being alienated by this woman's completely self-centered worldview.