Coffeemon Code is a game in which you catch Coffeemon. The more time you spend coding, the more you can catch.
Progress is lost when the app is closed (at least on web).
Download the APK from the release and install it.
Go to https://aal337.github.io/coffeemon-code/.
Download the JAR from the release and run it with java -jar <path-to-jar>.
Requires Java (https://jdk.java.net/25/).
Not officially. But see what you can do with a Mac and Xcode (maybe there are even some useful files in the release).
Input your Hackatime username and tap the button ("Catch one!").
License found in LICENSE.txt applies. Next to the binaries, you'll find more licenses. Those in ios.zip are from 3rd-party code that is contained in the would-be iOS app, kstore_LICENCE.txt for all platforms.