Using multiple devices I often have to change between, I also often get setback, sometimes for a day or longer. This happens when the progress is not synchronized to the cloud when I change to another device. Shutting down or logging out and in of google play does not seem to guarantee a synchronization.

It would be nice to have a button to force synchronization to the cloud. The version in the cloud should have a datetime tag. This tag should also be stored on the device doing the synchronization. When the game starts on any device, it should check if the tag it has is the same as the cloud. If not, it needs to download the cloud version before continuing the game.