I imported this game for the DC last year when it came out, and I absolutely adore it. It's not Treasure's best game, but it's up there with their best, pretty much. I never played "Radiant Silvergun," but who has? Haha...
Anyway, it's a frantic and fantastic game that anyone who likes or loves hard-core gaming should pick up. It's an old-fashioned shooter with new-fashioned graphical beauty and spot-on perfect control. You won't beat the game quick, so that's quite a consolation considering the game is so short. Shooters never were all THAT long--heck, think of how fast you could blast through "Lifeforce" for cripes sakes! Great stuff, certainly, but I'm also anxious to see what Treasure does with "Wario World," and I'd die if they made another game like "Guardian Heroes" or even a bigger version of an action-RPG like "Light Crusader," which had great puzzles but was so, so, so brief.