Fun idea! Positioning your ghosts and slowly closing in on PacPerson McMan is quite satisfying.
It would've been fun to have more than 1 level. PacPerson's AI could get smarter, he could move faster, or he could get the power-up candies which would force you to suddenly have to move your ghosts out of range again and breaking formation.
The current state is a bit rudimentary, but I can see this getting expanded upon in lots of interesting ways :)