Changing vantage point ended up not working for me, which was unfortunately frustrating because there ended up being several times where a guy was hiding behind a wall.
I like the core conceit of playing Guess Who? and merging it with a Flash sniper game, but the loop ended up eventually turning into me waiting for relevant info while I'm sitting back sipping coffee and then whittling information down bit by bit. One thing that I think might be good is to have the NPCs move back and forth, some of them trying to act casual, some of them zipping around in a panic, some of them trying to hide, and using that information to help deduce who's being suspicious.
Of course, that sort of thing would be extremely difficult to program in a week. As it stands now, this is pretty promising! I look forward to seeing if this gets developed further!