How about reducing the bricks again significantly, and instead measuring the time players take to complete the level? They could then post their high score to Facebook or something.

I felt the level was too easy, after a while it just got repetitive.

If you want to make it harder, then you should consider making it faster and the reflection angles a bit more random.

Or as Udo suggests, play for time.

I was expecting an easter egg on completion. Instead, i got 200 alert messages.