played through this game again since it was a while since I touched it...
here are some questions since you seem to be still answering them:
1: how long were each of the areas in 2 originally meant to be? primarily saying this only because some areas seem to end rather abruptly such as BRICK and URCHIN (not a problem for me though)
2: was TOWN (and URCHIN) supposed to have dreams at one point? kinda odd they don't have one...
3: is it supposed to be implied that the areas in 2 are just slowly trying to invade each other with things like SUNLIGHT dripping acid onto PLANT with its own tiles where the two areas meet, the themes of some bed dreams surrounding the bed itself, or those orbs in KISS that pattern themselves with a background of the CAVE area from above?