This is complete unity project source code. AdMob ads are integrated into this project.
All you need to do:

Go to assets – google mobile ads – settings and put your app id there (you can find your app id in AdMob console).
Open “Menus.cs” script and put your ad ids there.

You can test it here (WebGl): https://e-ugovor.rs/circular_breaker/
Or download test apk and test it on your android device: https://www.dropbox.com/s/zw857efy533h634/Circular%20Breaker%20test.apk?dl=1

Swipe left and right to control the paddle, don’t let the ball to hit the center. Try to complete all levels. As the game progresses it becomes harder and harder to pass the levels.