Test it here (WebGL)
Or download the test apk file and test it on your android device.
This is complete game source code.
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 interstitial ad id on line 64 for android and on line 66 for iOS.
Control an arrow along the path and don’t hit the edge. Tap the screen to turn left and right. As the game progresses the arrow begins to move faster and faster. Your goal is to score as much as you can. Collect the gems and use them to unlock new items in the shop menu.