People that don't get this game just haven't played it long enough.
They say the game has no objectives, but the more you play, the clearer the objectives become. This game has tons of trophies. If you need clear objectives, then try and get all the trophies. You also get a ranking among the rest of your fellow players. Make it your objective to reach the top (or close to it). Once I found out how to eat stuff, I made it my goal to eat everything in a level. It gives the game a kind of Katamari-vibe because the more you eat, the larger you get, and the larger the items you can eat.
And don't forget the movies you can record, and upload to YouTube.
Remember, this game is just a big sandbox, where you can do anything without restrictions. Remember Katamari, and how fun the eternal modes were? That's this game!
The depth of this game cannot be discovered in a single playthrough. Only upon repeated playthroughs and a mastering of everything the game has to offer does one truly understand the magic found in Noby Noby Boy.