You have an amount of time: ONE MINUTE.

Hold left mouse and release to shoot the white ball (hold longer shoot stronger).

If it doesn't hit red ball you gain 0 point. You lost the amount of time that the white ball run.
If it hit the rail x times before the first time it hit red ball, you gain x * x points. You lost the amount of time from start to the moment of first collision.

Try to get as many score as possible.

I use some external assets: