This game has been one of my best game because of it's simplicity and earning value
Also, the memory consumption has been one of the major factor which I view it as one of the best due to its low consumption and this is greatly enhance with a nice user interface and easier users interaction
It's challenges met has been lesser user which can be equated to high fee involved in engaging in the game
My suggestion:
The game earning is nice and its interface can be view as one of the best due to its low memory consumption hence reducing the fee will have a great impact in drawing more user to it