How many players do you recommend for you game? Also, what age range do you recommend - it sounds like an E game. :)
I am not the author of the game but I think I would run this with my usual gaming group size (3-5). I think as of the age range there is a small paragraph about safety tools in the file, which is mainly to ensure everyone is on the same page what they want in the game. As long as everyone who is participating knows what a Mary Sue is, I would think they have fun.