if radiant silvergun is out, that.
bangai-o otherwise.
pretty much any game by treasure works in this regards for live. though for some retail ones there's 3 main choices: raiden fighter aces, raiden 4, and deathsmiles. it'll be 4 soon when konami brings over the moe-heavy gradius clone.
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The future must protect the clone's past.
"Maybe it's a tentacle, molesting the planet itself. - Aschen Brodel.