Finished! that was...quite interesting.
I guess if no one else has complained about the constant pauses, it's okay. As I read, I got used to just constantly pressing space-bar. That said, I've also read ace attorney, and one of the things i didn't like about that one was the slow pacing of the text. The reason it bothers me more here, though, is because it's nvl mode and thus feels unnatural.
About the story itself, it's full of interesting things that make it entertaining to read, but I think it's hurt by two things.
1.
The horrific parts start unusually early, so there isn't much time to become familiar with the many characters. This is especially hindering for your story when you kill off so many of them in the first couple days of the story.
and 2.
The murders happen with very little between them and with very little connection shown between them. I know it's a horror story, but you've got a lot of chaos without much calm and structure, which makes it harder to feel like the horrific parts are supposed to be abnormal
Other than that I think the art and transitions are nice, with only the downside that they're so obviously from umineko. I'll be excited to see how well you do with making them your own. I would suggest that whatever style you use in CH2, try to make it fit the cgs more, as the ones in CH1 show a drastic contrast to the rest of the work, with the exception of the skull.
Lastly, I was very happy when I found out that
tatari was not the killer. seriously, with the name tatari, having him as the killer would've been pathetic.