I thought it was a little bit short, consisting basically of jumping on a few rails and then killing a boss, but what I played felt pretty tight, and it had promise. The idea of Flowmotion, while named kinda silly, is really fun, though it is a bit hard to see where they're trying to funnel you. Combat worked, and it worked very well. Though it was a bit strange to have so many spells and have no idea what they do, it was easy to swap between them and find what you were looking for.
The new character they introduced is neat, but I'm no sucker for the story of KH. It was still written very hammily.
Overall, though, it seemed really solid, though I don't know if I'm sold on a not-KH3.