Citrus-Engine
                                
                                
                                
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                        VirtualJoystick suggestion
instead of having a fixed central position, make the virtual joystick appear on first touch and disappear after a delay like some mobile games (I find this better to play with as I don't have to find the center with my fingers everytime)
Note to self/others : http://www.youtube.com/watch?v=dd8UwjPQuHc