Not just YATG but the entire UD mythos in general.
Every game, or visual engagement or sound file implies there's a secret or secrets within it.
The human brain has the endless damnable, hackable need for completion. Plenty of well done games exploit this basic necessity of the human condition.
So, UD definitely has us coming back and back again, game after game, offering after offering.
One tries their best to listen to every sound, analyze every silence, search every open window, delve every crack, in the hopeless pursuit of knowledge and understanding. It's an engaging, effect form of storytelling. We need to know what the secrets are - what the Why is.
... but then Occam's Razor tells us that the far likelier explanation is that an unnamed game dev is laughing their ass off at us trying to form patterns in absolute random bollocks.
Following that line of logic -
UnknownDev is a time lord and we're all being taken for a f***ing ride.
Cheers!