The well-designed and -implemented zoom out (basically a "level up" dopamine hit) is just one crucial bit of Katamari Damacy's greatness.
The other two are:
1. The whimsically melancholic music 2. King of All Cosmos' majestic facial hair and crotch bulge
Re: point 2.) Personally, it’s his bolster pillow shaped head that always brings me back for more.
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Not to mention his Royal Rainbow!