Some more updated impressions:
I love it. The battle system, while I still don't understand it completely, is very interesting (and, most of all, original) and there are some nice touches, like the option to speed up the battles that I find quite good. I wish I could understand some of the things that happen, but overall, it's a huge plus. The music and JP voices are excellent, and the game looks very good. There's a very noticeable texture pop-in when you enter an area, and a slowdown at the beginning at the battle, but it hardly bothers.
The game controls fine, I found that WASD+Mouse button+Mouse for the camera works perfectly in the menus, the maps and the battle screens.
Overall, the only thing I need to know is how's the story, but if it's good, this can be an excellent RPG. I give this demo a 9/10








