I worked for EB Games (pre-Gamestop takeover) when Katamari released. I loved it the second I touched it. In the following months, I offered it to every customer as an "add-on" to their purchase because it was only $20. I had a ton of regulars come back and tell me how much they enjoyed it. Hell, it was a recommendation that turned some non-regulars into regulars.
Very few pieces of entertainment media are able to evince an uncontrollable, goofy smile from the moment you see and hear it... to elicit pure joy in an instant. Katamari is as affecting as entertainment gets -- it's art. You won, Keita.