I'm kinda late to this discourse, but here's my two cents:
First, you nailed the general atmosphere of the game. The fuzzy sound effects and the child's small stature convey that she's still developing as an organism. The days, by taking so long to complete, show the effects of her isolation. The shower task being called "Wash yourself." is the line I find most telling, since my family typically uses "take a bath/shower" for cleaning your own person, and "wash" for your hands or dishes, mere extensions of your being.
Now, I would criticize the child's surprisingly strong understanding of language or the fact that she doesn't instinctively avert her eyes from the Sun, but not only am I unsure exactly how old she's meant to be, but those don't detract from the atmosphere too much.
For the most part, I don't think you took the subject matter seriously enough. You largely reduced the brunt of them to a mere "spooky Wham Line" in each ending; the reason why people think you're glorifying such horrible topics is because the narrative's efforts at horror (basically the genre for people who like being scared) unintentionally do so. The part where the child pretends to sleep is the only scene that successfully shows how ugly her situation is. (Nicky Case's review of the 2019 film Joker helped me understand how not to glorify violence and/or similar topics.)
Personally... I don't find the story sad or scary, only ugly. I don't really see what I have to gain from this experience, since it's rare for people to enjoy being disgusted. Disgust is a pretty powerful, primal defense mechanism. Looking back, I just feel like I took a sip of spoiled milk and wondered if someone spiked it with banana juice.
If you insist on keeping the specific subject matter as the kind of surprise it is, you should probably update your disclaimer, to state that if the viewer has any (I mean any) common triggers, they must either ask a friend whether the spoilers are harmful to them, or not take a chance with the game at all.