First I have to say that the character art was awesome! But I think it looked out of place against the platforms and backgrounds, which were of a much lower quality. The music was also pretty cool. I liked the gameplay although I noticed two issues:
1. Sometimes the sword would stop swinging (if this is some kind of stamina system or something then some kind of HUD would make this easier to grasp, or maybe it was just a bug)
2. I found that if you jumped on an enemy's head you could kind of ride it away, which gave me a laugh.
Overall a very aesthetically cool and promising game!