There's a demo of this up on XBL, and I have to say it's just pure fun.
I gave up on a lot of the recent ones, they went overboard with vehicles and silly gameplay mechanics.
In the demo, you jump, kick, spin, ride monsters, and collect crystals. does it get any better?
No pretty stereotypical crash boxes to break open though! AAAH!
But it's all cute as blazes, so I think I can forgive that ;)