Ghost Blocks

The mechanics of this game are the inverse of a traditional block-breaker: Blocks are created when the ball hits them, instead of being destroyed.

Shoot a ball around the course and try to activate all of the white circles by hitting them. The ball passes through the 'ghost blocks', unless the ball has recently hit a white circle.

I didn't get around to adding a win condition, so nothing happens when you activate all of the white circles.

Controls:
Aim: Left or Right Arrows
Shoot: Space or Enter