A port of ClassiCube for Android is now available - with some limitations however:
It's only available as an .apk download (Not available in the Google Play Store)
The .apk was compiled in debug mode, so it will be slower than normal
It's early alpha. It will very likely crash, freeze, perform poorly, etc.
Please report these to me so I can work on fixing them.
(Also note that the in-game UI of the Android version is almost exactly the same as the UI when you use the web client on android)