while exploring through the maze your father Pac-Man went, you were hearing a song that sound depressing and guilt-tripping at the same time after your father left them for 40 years as the song that sounds depressing is called "Quiet Slumber - Creepy Music Box" you might've encountered what looked like one of his rivals Inky, however, his sprite seemed to be all blue as his expression looked depressed and sad at the same time as he couldn't see anything but can hear and know, after running into him, he says in fear "Who’s there? Who’s there…?"