Played this with some kids today. They were having a great time!
One thing, though: feels like there should be some incentive to not waste bullets. Maybe have a bullet limit and if you can’t hit the impostor within, say, five bullets, the impostor wins? Otherwise they were using the Zapper like a minigun and just spraying bullets everywhere.
Another thing: the kids realised they could just walk off the screen and never be shot. They knew which one was the impostor because he would never come back onscreen. Maybe some sort of penalty for being offscreen too long?