The Arrows of Noor

Hint 1 of 7:

"What is the same will vanish; what is different will remain."

Hint 2 of 7:

This is another arcade-style game, rather than a puzzle.

Hint 3 of 7:

This puzzle requires a lot of mouse co-ordination.

Hint 4 of 7:

Use the mouse to align the arrow; click to "shoot".

Hint 5 of 7:

Try to move the arrow in small steps.

Hint 6 of 7:

Give preference to the front-most attackers.