We’ve put up a new version of the game with a potential fix to the multiplayer issues we’ve been having the last couple of days. Please update and let us know if you still have problems. There’s also a new version of Google Play Services available and it might be worth grabbing that as well.
In the update is also a potential fix for the blue screens that a couple of people have been having.
If you still get either of these problems, or any others, please get in touch at firstname.lastname@example.org