(I'd propose theories, but I may be cheating. I think I have had this conversation before with someone. Possibly the GM. Yeeaaaa)
Those conversations haven't unveiled any kind of actually useful information, so go on if you want to.
The plants are manufacturing oxygen (this is tha bit I thought I talked about). The Magma room is either energy, heat or some sort of byproduct room and the Arcane Room is gathering Arcane energy from some (psudo?)renewable source to power everything, presumably like the constant repairing faculties of the whole thing. The Portal Room is just that, the only way in and out. The Bridge room is just there to *bleep* with dodging and/or a nice defensive position between the portal room and everything else.
The Grand
Arena Room... is for
MURDER 
(Well, EVERYTHING is for murder, but I digress)
Also, Planky's actions will be decided by dice once he gets the ability to do things. It's the only way to make it fair.
Oh 20 sided balls! I am going to die. Do I at least get a friendship/creator bonus? *desperate*