It's great to see a bumper car game in a game jam. Your game is nice, but I was often frustrating in game. I'm not expert in this genre, but I think the steering is a bit too slow, it's too hard to chase a car if his direction is perpendicular to yours. I think red giant balls are a bit frustrating too, because they deal damage to you AND stop your car AND steal your energy. Player could just bump red giant ball to hit others whitout lose too much speed!
I've just give an honest feedback. I enjoyed your game (nice car modeling )!