Hi, i'm making a video about the Slendytubbies's history and i have some ask

[CronoSS31244]

Hi, I'm making a video about the Slendytubbies timeline, and there are a few things I'd like to ask, for example here, on the Discord server, and on the official forum. So if anyone knows anything about this, please reply, especially to compare information: What is the dream? What is ShadowTubby? Is What Comes After canon? Is the DLC canon? Is Lake Dipsy the mutation that grows from Dipsy's head?