The game is very well done but the fundemental premise just doesn't work. The game constantly insists that the player is evil due to what they are doing and that Harvey has real feelings and a life when that is objectively incorrect, and the fact you cannot stop hurting him takes away from the experience as the developer chastises you for doing it while effectively forcing you to do so.
I suppose it's more of a personal taste thing! I personally enjoy the sort of meta self awareness the trope plays with; I know logically he's been programmed to say all this, but it's fun to play along and pretend he *does* have a true life inside the game and is aware of us. That's the story the dev want's to tell, and it's a story I like seeing!
But for you, it might break the immersion and isn't as fun. And that's okay I think! Not every story works for everyone.
I DO agree in that I wish there was a way we could stop hurting him when he asks. But the dev themselves said it was kind of a storytelling aspect too- you made the choice to go further, spend the money you need to make getting it easier/to be sadistic, and you gotta live with that. You treated it like a game and didn't care how it'd affect Harvey, so in the realm of the story that's a decision you have to see through.
It's also me mostly me wanting more endings/dialogue lol, I just love discovering the different parts of these games.