How can I create this mechanism in my game?

Hi,

I would like help to create a mechanism in my game.

I have a clock hand in the center of the screen that rotates clockwise. Every 5 seconds his rotation jumps and returns to normal.

What I want to do is:

- when the player presses the space bar while the rotation is normal, he loses 1 point.

- when the player presses the space bar the moment the rotation speeds up, he gains 1 point.

- Measure the reaction time when the bar is pressed.

It's possible?

Any help is very welcome !!

Thanks!