I like to think that Toby Fox is actually two people at once
There is Toby Fox, the God and then there is the mortal Toby Fox, the human.
The human mortal exists only to contain the God, the first creator, a cage with human parts and soul.
Maybe its like a "Hulk" situation where The God comes out and the Human is restrained as they create these dark, yet darker wonderful things indeed and then when it is all done.
The God recedes control to The Mortal to sleep again another day, but idk lol