Summary: It's good fun for fans of the original Gamecube entry, even if it doesn't approach the heights of silly awesomeness that its predecessor scaled.
The game centers around a run-down urban park. Your job is to bring it up to snuff, mostly by planting flowers. To accomplish this, you're armed with a squirter that'll make buds grow, a boom box that turns the plain flowers into more colorful versions that spew buds everywhere, and many other tools. You'll also (eventually) get access to several vehicles, like bicycles, carts and canoes.
Much like the first title, you'll find many discarded toys lying around that can help you in your quest. After refilling their batteries and befriending them, they'll take on larger tasks in the park (tilling sandy soil so that flowers can be grown, building structures, etc.)
Your enemies are the Smoglings, led by an ex-good guy and his boss, an outright evil cloud of smog named Miasmo. Their irritating henchmen will pop up occasionally, requiring you to hunt them down before they can kill healthy flowers. They'll also periodically zap you, forcing you to look for your precious tools again.
Each day, you'll start out with a full battery charge and an alert system to tell you if you need to watch out for Smoglings. You'll spend most of your time going from patch to patch in the park, watering buds and getting flowers to dance in order to spread more buds everywhere. Every action will cause your energy meter to slowly run down, eventually forcing you to return to your charging station.
Doing this makes your Happy Point count grow, which you can use for both recharging your battery and paying for your friends to do landscaping work in the park. Over time, you'll earn rewards like additional tools and landscaping options, as well as larger batteries and more vehicles.
Overall, the game is really enjoyable. The graphics are excellent, capturing the spirit of the series nicely. They've done a good job of simplifying the console controls, incorporating some of the best stylus action that I've seen on the DS. Though some might find it tedious, every flower you grow improves both your park and Chibi Robo. Having options in a game that don't involve violence (unless you count blowing water at silly-looking minions 'violence') is a nice change of pace. Improving the lives of your toy friends also makes the player just feel good.
There are some minor criticisms that can be leveled. The story isn't as involving as the first game's story was, as it centers on the park rather than Chibi Robo and his adoptive family. It's even a bit preachy at times, depending on your tolerance for environmental hyperbole. You're told that you got more visitors each day, but you don't actually see them admiring your hard work. The area of the game, while perhaps technically larger than that of Chibi Robo, feels much smaller due to the fact that there's only a few locations, none of which are particularly interesting, all of which you can access from the start.
Unfortunately, due to an exclusive licensing deal, new copies can only be purchased at Wal-Mart in the U.S. It's well worth tracking down for fans of the first game, though, or for younger players who can't quite handle the controls of its Gamecube predecessor. Have fun!