For now, this page only containts a Google Doc I've been consistently updating for a few months before the release of Chapters 3 and 4. This was mostly a project aimed to gather my thoughts on the story's themes, mysteries, and metanarrative before the next release, so I could go into it with as clear a mind as possible. I plan on adding my thoughts and any potential theories as I play through the new content. I've always toyed with the idea of making an actual full DELTARUNE theory, so if I ever manage to connect some puzzle pieces that I feel are valuable enough insight to be archived, they will be here!
The document is linked here. Please note that this was all written upto March 2025, which will probably horrifically date this. Still, that was always part of my intention with this: to be able to point and laugh at what I believed before Chapters 3 and 4, and hopefully to act as proof if I end up predicting something actually interesting. This doc contains theories that I didn't come up with, and they are mostly ideas from the community at large. Because of that, I can't credit everything in it, but for more specific things I've mentioned the person from whom I found out about the theory.