This is the complete game source code with AdMob ads.

Test it here (WebGL)

Or download the test apk file and test it on your android device

To setup the AdMob ads follow these steps:

Go to Assets - > Google Mobile Ads -> Settings and put your app id (from your AdMob console) there.
Open the script "Menus.cs" and put your rewarded ad id on line 69 and your interstitial ad id on line 81 for android and on line 83 for iOS.

Spikes and stars are randomly spawning in front of the ball. Move the ball up and down to avoid the spikes and to collect the stars. Your main goal is to score as much as you can. As the game progresses it becomes harder and harder. Use the stars to buy new balls in the shop menu.

Up Down - (Unity Game) Simple Hyper Casual Game screenshots