My feelings are slightly mixed on what I'm seeing in this Demo. None of the new music really sticks out for me, and some graphics really hurt my eyes (confusion is the major problem here). I also don't care for the lack of Hero and Partner pokemon choices, but I suppose that it would be hard to put all of them in there seeing as it looks like all of the Pokemon (at least main story ones) have all emotion icons. Still, I'd like to play with my Totodile + Charmander duo like usual, but I can give Oshawott and Pikachu a shot.
The good parts, like usual, are the story and overall the graphics are nice. It's a nice change of pace from the guild system that was in the first two games, although I'm hoping to see a return of the badge features and badge level systems. I also like the rock formations that create holes in the large rooms. It's an interesting change of pace.