If you’ve ever played the game “Soldat” then you should find Pawn to be very similar. Pawn is basically a 2d side-scrolling platform shooter. Players are pitted against one another in an arena, and must try to outgun one another.
Pawn runs smoothly on a well made flash based engine, and doesn’t cause any graphical problems with its light-weight 2D graphics. While it is not very visually impressive, it does have its own unique style.
Unfortunately there aren’t very may players around, although there are always a few available.