It's fun.
Although it would be nice if there would be ties or if you don't want that, then have time as a tie-breaker. Also maybe have the level end when the balls are done rolling because it's kind of annoying wondering if it would have gone in or not. And finally, it would be nice if the higher you rank the more money you earn because I've won and lost to everybody else and it was just 75 coins for everybody so there really isn't an incentive to try to play.