Use WASD to control the tan toy soldier character while he tries to dodge bullets from the green army men. You will likely be hit, but you cannot die. So, in that case, just see how long you can survive before reaching a certain threshold. (100-200 bullets absorbed recommended) Challenge your friends to see who can last longer if you want to be competitive.
I took inspiration from the little toy army men from Toy Story. I don't know where they originated, but just remember them from that movie.