When I searched for the game you mentioned, the moment I saw the publisher Karin, it clicked immediately—Karin is my favorite visual-novel company. Their two main writers' early style is exactly that dark-gothic, cruel and unforgiving tone, which is one of my all-time favorite flavors. I can't recommend enough
アニマムンディ 終わりなき闇の舞踏; it's by the same writer, and it was actually the first BL game I ever played. It has a ton of endings, PC only, and it absolutely shattered my tiny heart back then~ I'm not sure if there's an English version, but if language isn't a barrier for you, definitely check it out! ❥(^_-)
你的ID太明显了吧,哈哈哈,这个平台非常有趣,不过因为语言壁垒国人不太多