This is a pretty sick game! I totally feel you with the time crunch lol. I was impressed by the initial design of the characters, but I think it's missing some animation to liven it up a little. The title screen is sick, I think I really captures the game as a whole/beginning (as title screens should do).
The AI is impressive, especially considering you only had, like, three days to make it!!
Only thing I'm missing is the theme, but maybe I'm not quite understanding it. It's funny, when ideas come to us game devs, we expect everyone to understand them. That's always been one of the tougher sides of game development for me: conveying my ideas properly.
I think you did a really great job of that until the reverb things. I don't get those. Either way, awesome job!
Oh, I also really like the mechanic where you can hit the opponent's dodgeball with your own. I know that's just like regular dodgeball, but still! That was probably pretty hard to code lol.