Dogyuun is a vertically scrolling science fiction themed shoot 'em up game where you take control of a brand new ship called Sylfers. You are send to an off world colony Dino that has send a distress call. When you arrive at the colony it has been overrun by an alien host and on top off that, communication is lost. You now face the alien hordes alone or with a friend.
You fight a variety of space crafts, static guns and bosses. While playing option boxes appear and when destroyed drop power-ups. These include: a speed power-up, a bomb, plus one up and four types of weapon patrons. These are Mega shot (blue), Psycho beam (pink), V-laser (green) and Homing fire (orange). When playing with a friend both ship can merge giving stronger weapons.