Fantastic!
This game is probably one of my favorite flash games. Graphics are good and you can even customize the quality and anti-aliasing (Not many online flash games have this feature), There is even scripting access available! You can purchase different modes, items, and skins for your buddy. My personal favorite item is the missile.
When hurting your buddy you obtain money (hurting your buddy is fun), and with that money you buy upgrades. As much as I like the game, it does get quite repetetive after a while. Anyway, GREAT job on making the game.