Excellent!
Ahhh, this is a fun little gadget! Unique idea too.
A few niggling bugs. Not being able to clear the screen after the simulation has been completed is one of them. Be nice if the guys had some different guns (and were a bit more accurate :D). It's a little bit slow too.
But these are all minor concerns. I can't wait to see if you expand upon this idea, add a few more options etc.
5.