Shmups

The games are Wolf Fang (a side-scrolling mech based run n' gun) and Skull Fang, a vertical scrolling shmup. From the article:

Skull Fang: As a member of the Skeleton Fang Platoon, the player boards a fighter plane and heads off to intercept enemy weapons approaching the defense line. Choose from four pilots with different skills and four fighter planes with different performance. On the battlefield, freely control the speed of your fighter plane and decide whether to take the risk and fly at high speed, or play it safe and fly slow to intercept the enemy. In boss battles, control your speed to mark the boss within range. The Saturn version is even more powerful with additional bosses, background music, and additional units in trial mode!