I'll give you points for visuals and music. The retro style was pretty good and I did like the music at the beginning, when it didn't grate on me when I went for the second ending. However on points of the goals you were trying to achieve with this, the story, and the game play in its self, despite being an interactive fiction, I can't give you much.
Like others have probably said the game play is slow and under minds everything. I get that this suppose to be slow paced and psychological but when I yawn during your game it's a bad sign. Games and fiction are supposed to keep the player/reader interested and awake, this did not. At first I was interested, that's true, but that's more dude to the music and the visuals that the interactive story bit or even the story itself.
The premise was okay and, while I don't think he was an outright rapist just a dude with a serious mental illness, the idea that he had no choice but to do what he did falls flat with me. There were a lot of things that could have been done to prevent her murder. Especially since the girl recognized there was something wrong. "I feel eyes on us when we're together." and "I don't like the way he looks at me." are two huge red flags that she seems just to ignore. Either one of them could have gotten help, could have confided in each other or friends and family. He could have easily told her about the voices, fought them down and fought the urge to hurt her if he truly loved her. Even after the murder the fact that he doesn't kill himself doesn't mean that he has to walk away scot-free. He could easily gone to the police and confessed, he could have easily confided in someone else, or killed himself later on. I can easily see things going differently and it kind of upsets me that you went with the most sophomoric, emo ideas/endings.
I get the idea that you're trying to present here, that love and death are easily intertwined, can get ahead of us, leading us down paths that seem even in hindsight inescapable, inevitable. But it's also a premise that has been explored many, many times over and you really haven't added anything new. All you've done is allow the audience to click to progress a story that would have otherwise been overlooked.
Take away the visuals, the music, and the interaction via the mouse clicking and the story is unremarkable, it doesn't stand out in the slightest from stories written by teenagers. I know I might sound a little mean, rude perhaps, but this is my honest opinion. Take a step back, really look at it and may you'll see what I see. Or maybe not. It's just may opinion after all.