Good job - as I've said quite a few times, I love this game! It reminds me of the 2D Sonic days, before his 3D mishaps.. The action is smooth, the graphics are great (thumbs up to the 3D bosses) and it just has a wonderful all-around "feel". I can't put it down, and I highly recommend it to anyone out there. I'd go as far as to say that it's my second favourite DS game, ahead of Castlevania, Advance Wars, Kirby and Meteos.
It's a real shame that, like Tony Hawk, it won't do as well as it could have since it was released so close to Mario Kart. I wish they had held off a bit and released it in Febraury or March. Then at least it wouldn't get caught up in the DS holiday frenzy, and it would get the interest it deserves.