That's a damn true title, I love Katamari.

This game starts off with a meta narrative with how everyone loved the original Katamari Damacy game even though it wasn't represented as a game in Katamari Damacy it was just the king fixing the stars of the real world but who cares it's a Katamari game.

Gameplay wise these two games are practically identical, the main difference between the two games is the style and presentation how We Love Katamari try to be more like a comedy with weird humor that just honestly works for me I think it's really charming and I love these cutscenes about the king's youth it's way better than the cube family from the original game.
The other main difference is how the stages are built, they are still the same thing but they have much more theme and gimmick in this game so it ends up being more creative for the better or worse. I think the stages in this game tend to be a bit hit or miss, some gimmicks can be cool while some can be annoying, while the original just did the "Roll to get bigger" for most of the main stages and these are still my favorite type of stages. Though when a We Love Katamari stage is good it's damn good like all of the objects are really well placed and the city stages feel a whole lot more lively they are way better than how they were in Katamari Damacy but unfortunately there are only two of them or so in the game, at least ones where you are tasked to get big.

Overall a good sequel to Katamari Damacy that improves and mostly just does the same as the original rather than straight up replacing it.