I have updated Letter for Mimi 2 on Newgrounds and kcnhgames to version 1.0.1. There was a bug where Roxy would wander outside of the bounds of the interior of Boulder builders inc. It had to do with the way the characters are handled while they are off-screen (they are still there, but invisible). So in some cases they might wander off (when they are in the bounds of the current Flixel camera). I am not sure why this doesn’t happen with characters who wander in the exterior, probably because all the interiors are located at x <= 10 and y <= 30 and you can't get there in the exterior. For the fix I just removed the 'wander' movement type from Roxy.