It is done. Finally we have published Sudowars on Google Play and you no longer have to download it from the Website and install the apk manually. I hope that more people encounter Sudowars now. And the best thing about it is you can read the source code, write more code or fork it.
I have many new ideas for Sudowars, but I don't know when I will find the time for it. Meanwhile, you can play the multiplayer.