I really enjoyed the pixel art for the character and the setting. The change in palette gave the impression that you were fighting all day and all night.
The air slash mechanic was satisfying to cut down enemies, but I would sometimes run out if I was trying to climb to a higher place. I liked the use of the slash refill as a way to allow you to traverse larger gaps.
The final scene had an ominous dream-like feeling that looked great with the color palette of the last level. Great work!