good impact, and a nice zoom at the beginning. i do have a few tips though.

– make sure each pose eases into the other. it kinda looks like their bodies are contorting and twisting impossibly for no reason. can be fixed with either inbetween frames or just less dynamic posing within movements.
– nice slowmo, but use it sparingly. it gets a little hard to tell whats slow motion and whats just a slow jump or something.
– ease through each position with a couple more start and end frames. it feels like theyre going from pose to pose without anything inbetween sometimes. like when the brown hair dude jumps he should keep a flow throughout the jump instead of stopping halfway through.

for your first fight though, this isnt bad. you show potential, keep practicing. and watch some alan becker tutorials.

good idea to finish a character movement before doing another movement.