i'll absolutely second the idea of bit trip complete for Wiiware. there's a disc with 'em all called that, so if you can get it that's good. otherwise the Bit Trip games are also on PC and 3DS (not sure if they're DSi/3DSware or not but as it got a bad collection port ia ssume it's there).
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"Maybe it's a tentacle, molesting the planet itself. - Aschen Brodel.