*rolls up 10 years late to the party holding a smoothie*
'Sup
So what if Deltarune (the world/game) was WD Gaster's solution to the barrier? He was the royal scientist before Alphys, and she was trying to find a way to harness determination to break the barrier at Asgore's request. We know that Gaster was studying dark worlds and that he "fell into his creation", so what's to say that he didn't use the dark world to create a new reality where he and his fellow monsters lived on the surface and are happy?
Maybe he thought that if there truly was no escape, then escapism was the next best thing.












