If I understood right, the answer to your first query might be the rule after that one~ If the player "hints" something about him/her coming from the real world, then the other player can figure it out. The only thing players aren't allowed to do on this chapter is directly tell other players that they're from the real world.
About the level cap, since the level you're allowed to gain is high, then I figured the level cap should be set high as well. This obviously didn't go as planned, so I might as well adjust.
Lastly, I am unsure of where I should place the picture "