This was so obvious. I was looking for a nice way to add color in the game and brother item so you can see if you where victorious or not, but wasn't satisfied. Well, I think that highlighting the reason is good enough.
So, this is the color code: if you see green, you won. If you see red, you lost. White is a draw.
On the Games view, the color is on the name of the opponent.
On the Brothers view, the color is on the informations about the last game you've played and concerns only that game.
You can update your app to get this improvement, or get the app from Google Play.