A few questions regarding the buttons below the board:

There is a "Back" button. I'm not sure if it is really necessary in the offline- and online game mode. How often you go back a few moves in a real game? I think this happens not as often as a "draw" or "decline2 request. I think this type of button (together with a "foreward" button) could be useful in a "repeat game" or "PGN view" mode where you can see every step of a game and this kind buttons could be used to go one half move forward or backward.
My question also is: What happens if I press the backward button? Will there also appear a forward button?

The "play" button: Is this the button I have to press to confirm my move? If yes I would think it should be bigger but a real test will clarify this.

Last but not least there is a "stop" button which will bring up the menu options. I think the current square icon is not the best because most of the people would assume thaat the game is stopping after they pressed the button. My proposal would be a "menu" button.

So all in all I would say the area below the board should contain only two buttons "confirm move" and "bring up game options" which will get all the (width) space available beside the players picture.

What do you think?

Anyway I'm really impressed what has be done from the first days of the project until now. Thanks for all the hard work!