You made me want to actually get a friend over and play this for a bit. This game is really fun!
Everything from the sound design, music, gameplay and visual style is top-notch. There's very little that I feel could be improved with this game aside from simply adding more of it! While I only played the game by myself, I was extremely impressed with how obvious it was that each character plays differently and actually have different attack strengths and movement speeds.
If there's anything I think the game could maybe use, it's a pause screen, as pressing escape mid-game takes you back to the main menu. While this is a minor nitpick, it's the only thing I can think of that the game could potentially benefit from having.
Be proud of this submission - it's extremely fun to play. Well done!!