Nice work on your film, I enjoyed it though there are a few things you could improve on.
As already said, the audio needs some work. If you can try source some more "powerful" sound effects for when you hit each other, that would help a lot. And as other people have said, the dialogue levels are a little hit and miss so that could do with some work.
Also, it seemed to me that at the time of the 2nd fight, the camera, or the efforts put in to filming, dropped significantly. The colour grading was off, the focus not great, whereas the first fight it all looked quite good. I also thought I noticed a bit too much editing of speed in that fight, though that may just be me.
Overall though I thought it was pretty good, definitely good for your first attempt. Look forward to seeing more!