Ok, I hope you'll see my comment. Same as others, ManlyBadassHero, you probably know the story by now, hope I am not boring you with it.
First of all, amazing art imo. Were you alone on the art? If so, congrats. Guess that makes you the father, hah? (Oh dang, then you'd be missing). Excellent work in general.
I kinda resonate with ImpTwins' opinion, but on the other hand, I feel what Embry is going through to be truly -horrific-. So... Perhaps the genre is not wrong.
Anyway, onto my input: I seem to interpret this as a fight against mental illness, or sickness, or some form of addiction; and am not alone in this. It doesn't explain the parents' fate, but it explains the Dr and "Embry"'s dialogues to me. Maybe depression? But again, perhaps my perception of it is shaped by my own experience.
I kinda hope for you saying "omg this is totally what I had in mind!!!", but I also know some creators like to keep it shady and mysterious for obvious reasons. Not break the magic, you know? But I'm also genuinely curious about what you wanted this story to tell. I've also seen people mention wasted childhoods, being forced to assume the role of an adult too early, and I can't say it sounds too farfetched. It would explain the absence of the parents, but it doesn't explain the whole monster aspect to me. I'm a cat, and curiosity will kill me - wait, you're also a cat. Help a fellow feline.
Regardless, thank you for this piece of art. I wish you the best of luck with any other work, and I'll be sure to check out Cemetary Mary, whose art also looks awesome. I sadly cannot play it myself for I am an absolute wuss!
Godspeed.
Edit: I forgot to mention, I kinda regret there's only one ending per your admission. Maybe you're tricking us though? And then, there are two paths to the basement, if you catch my drift... If I had anything to complain about, it's I'm not sure whether our choices matter at all. While it's an awesome open ending I'm seeing, I do find multiple endings to be more satisfying!