Nice little game, solid 3D foundation.
I really like the animations and character models used. Were they created from scratch, or were they used from another source? The combos and kicks were extremely smooth, and felt satisfying to use, although I think the game could have used a few sound effects in order to make the attacks feel even better.
I did run into a few issues, most of them after the game had ended... Sort of.
First of all, when the player dies, the game doesn't end, and the AI opponent continues to attack your corpse. While this one isn't so much an issue since it doesn't affect the actual gameplay, the next two really are.
If you happen to wander back to your movement keys, you'll realise that you can still move around as a lifeless body for the remainder of the time spent playing the game. And if you happen to press one of the attack keys, you'll suddenly spring back to life and be able to attack and defeat your opponent again. This also makes it so your opponent cannot further damage you, leaving you to suffer with your immortality until you close the game.
Outside of the gameplay, the controls weren't listed anywhere in the game, and the game could not be paused.
It was still fun to go through though, well done.