You keep moving in one direction. Don’t ever change directions. Eventually, Pac-Man stops warping to the other side of the screen and is taken to a new secret area.
Squirrels, crustaceans, corvids, mushrooms, and lizards have all been reported to speak comprehensible languages, which has been known for almost 35 years. Whatever source you're getting this from must be outdated.
They tried to create a story, and didn't want time travelers to find out before everyone else. When the storywriters couldn't figure out how to add it on, it was scrapped entirely and they just decided to put in the usual holidays they were going to add later instead.