Change the angle of gameplay to 180 degrees, I believe. The ball isn't falling, it's just the game moving downwards.
Go to the Game Mind Maps(or the section where shows all the Worlds and Wordls UIs) click to the Play word and in the game direction you can put the direction of the game, in your case is 90 degrees to go down(I supose), so there are other options that you can change as Velocity Drag, Friction and etc.