Sorry for being late with the reply and you properly already figured it out by now but there's 4 Power Orbs and hundreds of dots in the maze, your main goal is to collect evry single dot in the maze and to assist you with finding the last ones they will start to release a small light upwards when you reach about 30500 score.
the Power Orbs are mainly to fend of Blinky and removing the train of ghosts behind her aswell as removing a piece of clothing when you touch her. (and gives you 200 points when you do so.)