Suggestions: Retreat button, level builder, a tank dies if it completely falls over, pause button, more levels, the building menu only appears if you click on it, you cant click through multiple tanks, if a tank touches a coin it should pick it up, the ability to change your base turret, stationary turrets, different types of factories, a set of buttons that controls all of the tanks at once, more tank upgrades, more tank colors, and a sequel for all of that to fit in.