You Only Tap Once is a simple mobile game about chain reactions. It was created as a small test to get familiar with libGDX, a Java game framework, and GitHub in general. If you feel like downloading the game, or just want to view a few screenshots, you can take a look at the Google Play page. Currently the game is only avaiible for Android, but since it's made with libGDX it could be released for iOS at some point.
It's my first game developed with libGDX, so if you find anything I could have done better, please feel free to create a pull request or let me know otherwise.