Board Thread:General Discussion/@comment-26006155-20190617222636/@comment-32182236-20190628224005

Like how in Undertale your SOUL always makes the teleport sound and enters a pocket dimension for battles. But in Deltarune, your heart can actually be damaged in the overworld, right where you are.

That's in the Dark World. We don't have any overworld battles in Deltarune. And in the Dark World, the UI is different as well. This is probably a difference between Undertale's world and the Dark World. We don't know whether or not this difference also applies to Deltarune's world, but if it does, then that's a prediction my theory made (that they're two completely different worlds), and a failed prediction by yours.

So, according to Gaster.. or part of him anyway.. we can change the future?

I know, right? If Gaster was having us relive Chara's story, our choices shouldn't matter. So that busts another hole in your theory.