Eco Fighters

Eco Fighters is a 2D arcade game. The player controls a airplane with a rotating gun, and shoots various enemies. The gun can rotate in 360 degrees, and the player can shoot backward.

The game has an "eco-friendly" theme - the player fights against various polluters. Eco Fighters was originally concepted not by a professional at Capcom, but by a specific (lucky) gamer, who won a contest in Japan.