What can you say about this idea?

Um, I recently started making a story-driven game, but when I told my brother the plot, he honestly said that it was pretty boring. This has been bothering me lately and I don't know if I should continue developing it at all, because as a rule, my games have great graphics, but a bad plot.

In short and without spoilers: The main character wakes up in someone else's basement, kidnapped by one of the guys who bullied her. He gives her everything she couldn't get in her poor life, but cruelly punishes her for any "wrong" behavior. And in parallel, the kidnapper takes revenge for his victim on his friends, who turned her already hard life into Hell. This is a story about the cyclical nature of the victim's life, about the development of Stockholm syndrome and the attempt to free herself from it. I would like the mood of the game to be disturbing and cruel.

I don't think this idea is trivial, but usually my opinion on the plot is unpopular, so I want to ask you all.