What is happening? – Pool Club - 8 Ball Billiards, 9 Ball Billiard Game Review

Is this a prank? I could not figure out what was happening. The balls keep rolling around, apparently randomly. Then I realized entire pool table tilts in the direction that you hold your phone. All the balls slam from side to side as you tilt your phone. Why? Do you think the person who made this game knows what pool is?
Review by Busty scoots on Pool Club - 8 Ball Billiards, 9 Ball Billiard Game.