Wow this is a complete game. Different arenas and "weapons", multiplayer, upgrades... I was really engaged playing it, and even made a few runs to test different "builds" (and IMO agility is king, haha).
I love that you can win both by score or by killing the opponent. This is a simple feature that adds a whole new layer of strategy and makes it possible to reverse matches where the score difference is already too large to catch up.
Art assests were used really creatively. Polish was also great, although balance seemed I little random and could be tweaked to be more gradual.
Outstanding work, congrats!