I think the idea is very nice but there is a cheat for your game :S If you get the robot to stand on top of the boys head, he will eat up the ghosts forever as they all come towards the boy :D I think to make it more challenging you should make the boy move around to random places. As others have mentioned a scoreboard would be nice to have a well to see how many ghosts you've chomped down. Good job and keep it up!!