Its simple, just swipe on your screen, the ball will yeet in the direction the "circle" is, with relative force applied.
Dont leave the map, touch water or touch red laser blocks, or youll have to restart the level.
Other objects and what they do:
Waterfall/blue laser blocks: Pushes you down
Mud: Is sticky, careful
Ice: Break by slaming into it with full speed
Green laser blocks: Pushes you up