Nice concept that would be interesting to see expanded upon. I'm not sure what counts as a suspicious area, so I just ended up spamming E. As a small suggestion, I think it would be nice to have some extra aid (Whether visual/auditory/etc.) on where to look.
During my game, I also only found one clue, but luckily it's the right clue to find out who the killer is! May I ask how you can figure out if the lead is right or not since I couldn't tell ;v;