Loving this game
However I have seen some problems, where the person who starts will usually have the advantage as they start first, 8/10 times if I start I will win.
A possible fix would maybe add rounds. Where the winner will be the one with the most points at the end of the round.
Another problem is the lacking ability to delete opened games, some people never play the game so it just adds up.
And thirdly the game seems to stop responding when the screen switches off so the game needs to be restarted to see the updates.
A suggestion maybe to have cross compatibility with iOS (I don't know if it does).
Another suggestion would to maybe implement a difficulty setting where you have easy/normal/hard.