It's more of an action-adventure game than an RPG but it's loads of fun. I've only been putting it down when my hands start hurting too much to let me continue. There's lots of good information out there about it, as it's been getting excellent reviews (I believe it was even EGM's handheld game of the month). I highly recommend it for those who are looking for a fun, quirky game.
Of course, this is a tough time. Which Square Enix games to pick? We have Rocket Slime, next week is Valkyrie Profile Silmeria, and in the next couple of months we have Final Fantasy XII and Final Fantasy III coming out. Still, I suggest you give this great title a try. Hey, it gives a person a great excuse to go pick up a black or pink DS Lite. ;)