so.. how do i shoot ball?

Press space to catch ball,
Hold space to charge angle of throw (aim for the mid-point)
Release space to set angle,
Alternate N and B to charge power of throw.

Bad angles waste power. If the ball doesn't go far enough, you won't be ready to catch again by the time it comes back.
Better catches make it easier to charge power.
Try to catch too early and you'll totally miss it and get pwnt. Too late results in the same.

The three balls have different damage to ease of throwing ratios.
Gray ball on the left, aluminium; easy to throw, but will do relatively little damage.
Middle ball (Steel ball); Your generic 'average'.
Ball on the right (I forget the alloy, think it started with T..Tungsten?); More difficult to throw, but deals devastating damage. You can one-hit destroy any of the three objectives with this, i've done over 12500 tons of damage at 800m distance.

THE MISSION IS NEVER END!

Nice response time on getting the updated version in, there.

So for anyone who reads now, disregard my previous comment's claim of one-hitting anything with the third Ball, difficulty levels and the 100000t challenge weren't in that version. :V