This is a very good game you made. I like the bumper car-style gameplay. Normally, this would a very boring game, but the fact that there was little light in the arena made it more fun and challenging. It gets a little hectic after the 10,000-point mark when dark circles come in like a swarm of bees, but that's a good thing, because if that element wasn't there, this game would be too easy and too boring. I have some suggestions that you can use if you decide to make a sequel.
_-List of Suggestions-_
* More power-ups, the only power-up in this game was lighting the area for a small time. Maybe you should have power-ups like missles, extra push, extra lives, or an EMP Shockwave that pushes all dark circles out.
* Battle arena where you have to knock out all the dark circles within a time limit.
Awesome game! Keep up the good work!