Okay - you guys know I like history, so here's a piece.
(Thanks to insert credit)
Gunvalkyie is a quintessential Sega hardcore game: hard to get into, hard to learn, and once you "get it" you pretty much rant and rave about how great it is, even if nobody agrees with you. My friend Lee could do the *craziest* stuff on that game, including beat it in an impressive fashion. My old roommate David loved it. Me? I thought it was cool, but to be honest my hands suck at technical gameplay. Like Virtua Fighter, Virtual On and other Sega titles, Gunvalkyrie required a level of precision that most people simply would not commit themselves to (I certainly didn't), but the end result was a kind of hardcore, deliberate-twitch Zen state similar to what you'd see in Japanese 2d-shooters like Mars Matrix or Ikaruga.
Anyhow, it seems it was originally slated to be a Dreamcast game but got rescued by being released on the Xbox. Will we ever see a sequel? Probably not. But its still cool.