some hits on the robot heads were weird. and would have the balls get sorta stuck on the head. but you can roll forward and the ball kinda follows. you can repeat that to move the balls to the side.
during the last level, i noticed that the doors seemed to cause issues with balls as they would no fall into their pits after closing the doors too soon.
overall a great game, would have loved more levels!
PS I now hate the color purple...