I think it would be neat if you could get bonus points for multiple clicks within the same arc. So like if you click right when the ball enters the arc, and there's sufficient distance left before the end of the arc, you could click again (multiple times, quickly) and get bonus points until the ball reaches the end of the arc, at which point a new arc would be generated as usual. I just think it would be fun to line up a long arc and mash the space bar for a bit.