Soukyugurentai is an old-school 2D shooting masterpiece that fans of the genre really shouldn't miss.
Simply put, this is the finest example of the genre you will find on any platform, home or arcade, to date.
Cyberbots: Fullmetal Madness
Although it's not Capcom's best work, it's a near perfect translation of the Japanese arcade version.
Lunar 2: Eternal Blue
Those with a tolerance or desire for older games and the nostalgia inherent in them will definitely want to give Lunar 2 a shot.