Generic shooter
You have the choice of playing as biplane or a blimp (hardly the best kind of combat vehicle) as you fly through several slightly atmospheric stages blasting at generic enemies and catching generic power-ups. There's almost no skill involved in it at all.
I can't think of anything to recommend this game. The Gameboy Advance version features slightly improved graphics and altered cut scenes, but would still never ever consider paying full price for this. If you're desperately keen then pay less than half price for the GBA version if you can and ignore the Sega release.