Things I would improve:
+The model could use some light shading as the contrast on her is completely flat. You can improve this by adding shadows to detail contours on her body.
+There's a couple of frames where you see the bottom part of her leg as a stump in the loop. You can can fix this by drawing the leg a bit more or adding a dynamic camera that'll frame that out.
+The part where she jumps and kicks is clearly slow-motiony but the effect is loss when the bg keeps scrolling at the same speed behind her. You can fix this by slowing (easing) the background when she jumps and kicks mid-air.
+Just a thought, you can really enhance this spin and chaos in the screen by having particles in the foreground and mid background. For example, the particles could be stars in the background that scroll slightly slower than the purple clouds--or sakura leaves flowing fast in the absolute foreground and slightly more slowly just behind the fighter.
+last note, if you added a dynamic camera pov, you could shake the view a bit upon each impact to emphasize it a bit more.