Fun game! When I tried to create my first character, there weren't any customization options and my player didn't generate. I did have the option to choose a body type and skin color for my second character, so I played with that one. Before and after my first fight, I didn't have access to any other customization options or combos (not sure if I should've though).
Some things that weren't super intuitive, holding the timer to pause the game, movement (beyond punching and kicking), and defending. I did figure out how to block eventually but ducking didn't seem to do anything for me in the early rounds. I'm guessing that's more to avoid a roundhouse kick.
Overall good work and the sound effects really elevate the game!