Nice game! I feel like multiplayer games have an advantage over single player games in that it's usually fun when you play anything with your friends, but it's also harder to test when you're alone. Anyways, the concept was true to the theme and you've used it in a really cool way. Although, the ball physics are a bit unpredictable for me, considering it's a pvp game. I also feel like the screenshake is a bit strong.
Overall, I had a lot of fun playing this.