This film is way more fucked up than anything you've seen but the overall impact doesn't affect you as much because of the way the film is presented. I don't understand why the creator choose to do this. I liked a lot of it the idea is unique but there was some messed up things the protagonist eventually does and yes there were plenty of bad things that happened to him but again the impact was lacking.
I did feel sad at those parts but not enough for the guy to react in the way he did after basically being 'a good person ' all this time. I couldn't see his crazy, i couldn't feel that switch flipping in his brain, so the end I'm not opposed to dark nihilistic endings but this one just wasn't believable.
Still, for the overall story I feel it's worth watching.