This is some seriously impressive stuff, the whole team should be really proud of this submission!
I was suprised to see some more in-depth features such as a character customizer, and a functioning one at that. The controls worked perfectly, the movement and animations behind them being really satisfying to control. The addition of an AI opponent was a welcome surprise as well.
I should mention that while your controls worked well, it could be improved by having the ability to pause the game. I did try to press keys like esc and backspace to try and pause, so I'm going to assume there wasn't one (please correct me if I'm wrong!). In this pause menu, you could have a quick refresher on the controls if the player needed it.
The only other issue I found is that by simply walking up to your opponent and mashing the E key, you could win the game after less than a minute. I tested this a few times and managed it on each one. While maybe not a pure problem, I believe that the ability to block to take reduced damage in exchange for not being able to attack could prevent this kind of "cheese strategy" of sorts from being able to occur as easily.
Aside from these little nitpicks, this game was genuinely really fun to play. Well done!