Ah, so you are actually using Render Textures. I made portals using special depth shader, but it did not allow two portals to be visible at the same time. I have a question. Do you scale your render texture to fit portal, or it is some strange shader that does not use normals in displaying texture?
Once I saw a family making a Puma hats (original or not, no difference) like that during my holiday in China. You know, making games about this won't help anyone. It is not supposed to be fun! People are dying there.
Please, don't use iTween anymore, it makes always a lot of bugs during transitions. Better make your own transition script or create a First Person game from it.
 "Out of Time"){kind=icon}
 "Water Apocalypse"){kind=icon}
 "The Black Lighthouse"){kind=icon}
 "Mind Trap"){kind=icon}
 "10 second test"){kind=icon}
 "Cave Astronaut - LD27 Entry"){kind=icon}
 "an horror story"){kind=icon}
 "Adventures of Schrodinger cat"){kind=icon}
 "Posies"){kind=icon}
 "Rocket!"){kind=icon}
 "Portalizer"){kind=icon}
 "Doctor Who - Inside 11's Tardis. . ."){kind=icon}
 "Papa Louie 2: When Burgers Attack!"){kind=icon}
 "Twisted Direction"){kind=icon}
 "Sweatshop"){kind=icon}
 "The Tell Tale Trials"){kind=icon}
 "Gimme Back My Keys"){kind=icon}
 "It came from space, and ate our brains!"){kind=icon}
 "Fragments of Him"){kind=icon}
Yeah, it's just a demo, all those would be included in the final version.