Really, really great core mechanics here--it was super satisfying linking clues to people and unlocking new information, and I enjoyed the story. I also noticed some nice quality-of-life features, like marking new clues with a star. All in all, good stuff. And super impressive without a game engine! I'd definitely enjoy more mysteries in this format.
Moving forward, I do think a little built-in tutorialization/hinting would be nice--what you were supposed to do wasn't intuitive at first glance.