It took me almost 30 minutes to figure out that the story wasn't finished yet (my bad XD). I thought this had a really interesting setup! Had a bit of foreshadowing in the beginning while talking to Ralph (didn't read the little header description thing, so I didn't know what I was getting myself into). I have to say that the sudden shift of background color from black to white was kinda blinding (unfortunately had brightness on high...) so maybe try to avoid that a bit more in the future as it could affect some people. Or maybe have a slow color transition from black to white (I never used twine before, so I don't know if thats possible). Besides that, I liked how you played around with the text and background colors. The colors were all well coordinated and defined, so players know if a sentence is a testimony or if its the character inner dialogue just from the colors alone.
I liked the way you written some of the characters witness reports! The all caps and extension of letters to words adds a lot to their personality, which I really enjoyed! There were a few grammatical errors that I picked up while playing through that I don't think were intentional, but idk. I also feel like there was an inconsistency with the info given, not gonna spoil just in case, but it was somewhere in the "consult colleagues on site" section (only a minor inconsistency that doesn't affect the game that much anyway). Also I thought that the "truth" behind the mystery was a bit too on the nose, but I still enjoyed the journey getting to that truth! Reading through the mysteries and trying to piece things together was fun! The end part also was a really neat bookend to the narrative!
All in all, I could see a lot of the fragments of what your original scope of the game was supposed to be, and I see a lot of potential with a story like this! Hopefully you continue making this game and see it through to the end! Nice work! P.S. I really liked the amount of customization you gave to the player in the settings :)