Is each sburb or sgrub session in its own reality or do they follow a sort of timeline (trolls were before humans, and live on the asteroid belt that separates prospit and deres)? I know the meteor could travel through the void to the alpha kids session, but the ship had to go through a fourth wall to enter.

Each Incipisphere exists in its own sort of Pocket Dimension isolated from the rest, somewhere in the Furthest Ring.