ye can now create doors (which creates a new room).
Only one door per person per area, 'n the only areas allowed for now be outside 'n underground.
Doors can only be placed if surrounded by background tiles (at least 3x3 tiles).

Use this block pattern in the MakerMeow t' create a door:
RRD
RRD
RRD

R = red, D = dirt

The rooms be currently not very customizable but that will improve in the next update.