Very simple, I like it. The UI for me is a little bit outside of the screen for me. The gameplay is cool and fun, I like how some of the npcs have red herring facts, and you can't just base it off of one claim. Maybe it would be cool if the npcs referenced each other, or if there were more complicated facts, maybe like:
The park was close to the murder
Victim was stabbed 8 times
A was with B
B was at the park
A's favourite number is 8
B's favourite number is 2