The license is GPL-2.0-only
This is the repository, which builds this Android game "Non Stop Balloons: Shooter for Kids and Adults", https://metatransapps.com/non-stop-balloons-shooter-for-kids-and-adults/ developed by Metatrans Apps.
In order to build it, you need to pull this repository. Then the structure could be imported in Android Studio or the Gradle build could be started manually.