Sublime. The music, design, sound effects, and general goofiness are mesmerizing, but the real joy comes from the progression of gameplay and game feel throughout. Despite performing the same very simple actions, (rolling and turning a ball to pick things up) the FEEL of these actions changes drastically as the level (and the game as a whole) progresses. The joy as you shift from defenseless prey to predator as you outgrow animals is awesome. It is also incredible how the geometry of the level changes as you grow- what were once obstacles become paths, and then later mere objects to adhere to your ever-growing katamari. I loved the feeling of power as you achieve the desired goal with time leftover, and spend the last minutes on a careless mad-dash, steamrolling everything in your path.

While the base game is very casual and easily completed, there is so much challenge if you seek it out- not only in the difficult Ursa Major and Taurus levels, but also in exploring and trying to acquire every item and present. I don't think I could ever get bored of this.