Could be good.
You say you want this to be one of the best games on NG. Well it's possible, at a big stretch. I enjoyed this version, but there's still work to do.
The graphics were very good and i liked the way it was 3Dish but it was almost wasted because it often just looked weird. I'd constantly appear behind forground objects and in front of background objects. Depths can be a nightmare I know, but you really need to fix them.
The gameplay was good, but a bit unoriginal, I didn't see anything I hadn't before. Combat was weak, you need some level of combos and a range of attacks.
I didn't like the controls, they confused me. I'd prefer it if action and attack were the same button. Jumping didn't feel quite right either. The sound was average.
I hope the final game has some form of story. I know this is a demo but I dropped it from 9 to 8 because of the ending, the game just froze after the swing-chain room (or maybe this was a bug, I don't know).
I hope this review doesn't come across as negative, I really liked the game, reminded me of a show called Knightmare. I hope you put a lot of effort in the final game because it could be a classic.