Really cool demo! I enjoyed it a lot. Very highly polished game feel. The only thing I would say is the boss fight seemed to not have any purpose/lead up to why there was a fight... Also the boss's health or battle time was hard to determine if the attacks actually had any effect - not knowing if the battle would end? But it finally did. I also didn't know I was collecting souls/crystals... It came as a surprise to me that was the point of exploring. I thought more story would reveal itself or something?
Aside from the story elements / purpose of playing - the gameplay was highly polished and had a wonderful feel! The demo shows a lot of promise!!