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To answer your theory about Omori and the closet, the black light bulb in the Headspace is synonymous with the rejections of thinking (in the popular mind, a light bulb is synonymous with an idea) therefore the white space is literally Sunny's thoughts as he forces himself to forget what he did (the toy box under the light bulb is off, a sign that he doesn't want to see what he did)
ik, HOWEVER :P I headcanon Sunny as bisexual and just think it’s fun to think of Whitespace originally being based on a repression of Sunny’s sexuality! There’s lots of evidence to suggest headspace existed before Mari fell, so why not imagine a timeline where Whitespace existed beforehand bc Sunny was bisexual and growing up in a small religious town sometime in the early 2000’s and never really learned about these things and then was scared that something was wrong with him?