Did you try signed or unsigned? Looks like signed one doesnt save anyways so unsigned is the only reasonable one to use i assume?
Also, @OP could you upload to somewhere else man? The transfer quota does not allow both files to be downloaded within the same day -- ı learnt the hard way that the unsigned one is the one I want for online saving..
Does anyone know how to login with Facebook using the unsigned APK? It says "app is not activated" and the embedded browser is not working.
May I ask how it's possible to save your progress to access on different devices? I managed to make the unsigned apk work on the emulator, but the progress is not being saved on Play Store so it's kinda pointless I believe?
Edit: PvP also never finds a game so I assume that the progress will never be saved? I swear I see people using cheats in online pvp though :)