Thank you for your feedback!
As for missing out on extras and not being able to clear the screen - one strategy is to lure the ghosts to one side of the maze and then go through the edge to appear on the other side. If you've already tried that, my only other advice is to avoid the ghosts, and wait for them at the expense of time.
As for easter eggs...
nnuɯǝɥʇɟoɹouɹǝɔʇǝɟlɯoʇoʇqǝɥʇʞlᴉɔɔ