Yeah, at first I wanted it to be an easter egg, but it sort of developed into more than that. There are more easter eggs too that I haven't heard many people talk about, so I'll throw one out there: you can double press enter or confirm when selecting one of the game icons (Pac-Man Plus included) to go straight into a the game based on its original settings.
Okay, that's a lame easter egg. Heres a better one: Press the O key on your keyboard when selecting game options before you start a game. A little icon will show up on the bottom bar if you did it correctly.