All I know is the more you beat, the more you get.  I am a Panzer fan big time.  I believe it redifines the "shooting" game in alot of way, and they are all good too.  And there is a sequel for questioners on that fact, at the end of the games it says that "While this legend has ended, a new one prepares to unfold.  Love the bad guy by the way, such a cool character design, that and i love the place Orta follows him to, i believe it is the most visually stunning game, not for its realism, but just the whole fantastic world they present to us.  I almost cried at how cool the "Floating Island Creature" was.