My partner (who already wrote to you on twitter I think) just showed this to me and wowowow this was incredibly cool!
The whole time while playing I was like" Oh no, why is it just a demo, I don't want this to end" xD
It felt really really polished in every aspect. The mapping is nice especially the light, I love what you did to the enemy battlers and the story and atmosphere were also really engaging.
The chibi heads on the HINE sprites (?) look a bit strange in my opinion, but it's nothing that would stop me from enjoying the game. Also I think the Limit skill animations could be a bit more flashy (if it's not planned for the higher levels already).
However, those are just minor things, overall I am totally hyped for the full version

It's definitely one of the most promising rpg maker demos I've ever played.