Just use default plane mesh for mesh Instance and this plane you can see from one side and from another you cannot , but nice idea , I got almost the same idea for one of my future games.. I liked to play yours game
thanks again, i think when the voting session ends we are going to release just a "more fixed" version of the game, so nothing like major changes will be done, but if after that the whole team want to keep on with the project and complete the game i'll follow your suggestion, glad you enjoyed this prototype