As someone who ranks 999 as one of my favorite games, I knew this was going to be up my alley. I could nitpick about the puzzles being linear or the writing being a tad verbose for my tastes, but outside of this sentence I won't. I do think building this in Renpy will be a bit of a challenge, but definitely doable. That said, the interface worked perfectly fine for what it was. For a demo I was shocked at the presence of voice acting. Though I did find myself skipping a lot since I could read the dialogue much faster than they could say it. Overall, the presentation was done well for a vertical slice like this. If this builds on the mystery and introduces some creative puzzles I'd gladly drop money on the final product.