My first impression: It's only playable in full screen, and it's not actually "full screen". It's probably an issue with setting the size in itch, so could be a simple fix. Not a major problem,but it made it really hard to read the small text on the files. I had to zoom in on my computer to read them.
I think the tutorial UI is difficult to read(dark text on dark background, arrow blends in, etc), but that's expected in the short time you had to make it.
The biggest issue is I don't see any way to go to the other rooms mentioned in the files. I might be missing something, but is there some way to get information about the suspects? I didn't see any way to talk to them, or any files about them, so I had to guess randomly to see the ending.
Overall, I like the concept and love the visual identity, but it definitely needs more polish before I'd consider it a full game. If you update it later, let me know! I'd love to play more.