Window.cs

            Rect lastRect = GUILayoutUtility.GetLastRect();
            if (Event.current.type == EventType.Repaint)
            {
                if (game == null)
                {
                    game = new Game();
                    game.Restart(lastRect);
                }
                game.Update();
            }
            else if (Event.current.type == EventType.MouseUp && lastRect.Contains(Event.current.mousePosition))
            {
                game.Click(Event.current.mousePosition);
            }
            Redraw();