As someone who played the original to death, I can tell you this is a pretty damn faithful remake. I do have a few nitpicks (a lot of sound effects play at the wrong pitch and none of the returning cousins have the redesigns they got in the original) but if you're playing for the first time that won't really matter.
The new content is, unfortunately, definitely the weakest part of this game. The Royal Reverie levels are boring at best and frustrating at worst, with significantly more awkward translation than the rest of the game. The Namco stickers, while cute, require you to constantly be wearing the camera accessory if you want to actually interact with them (though, to be fair, the camera being an equipable accessory was a problem in the original as well).
Still, both of these are purely optional and can be ignored without any consequences. If you've never experienced the original PS2 game before, I'd definitely recommend picking it up. Maybe if it does well enough, we can convince them to port Katamari Forever next...
The new content is, unfortunately, definitely the weakest part of this game. The Royal Reverie levels are boring at best and frustrating at worst, with significantly more awkward translation than the rest of the game. The Namco stickers, while cute, require you to constantly be wearing the camera accessory if you want to actually interact with them (though, to be fair, the camera being an equipable accessory was a problem in the original as well).
Still, both of these are purely optional and can be ignored without any consequences. If you've never experienced the original PS2 game before, I'd definitely recommend picking it up. Maybe if it does well enough, we can convince them to port Katamari Forever next...