Played through it and the sequel - greatly enjoyed both!
Hmm - I see there's a PSP version - [link|http://en.wikipedia.org/wiki/Me_%26_My_Katamari|Me & My Katamari]. I've been debating a PSP after finding out about [link|http://en.wikipedia.org/wiki/Ratchet_&_Clank:_Size_Matters|Ratchet & Clank: Size Matters]. Katamari on the PSP tips the scale a little more :)