I think it is good to be protective if you have poured a lot of time and effort in the project thou it does not mean you can get into a blind rage if someone dislikes or critizes it. Each to their own. As long as they respect it while doing so and if not, then you be composed about and kindly say screw off while finding someone who will enjoy the world as much as you. If someone gives their reasons why they dislike it or if they critize it, use that as a means to make the world better or different from others. If every sci fi world was like star trek or star wars, it would feel limited and boring imo. Add and make veriatiy while keeping somethings that poeple are familiar with and enjoy. Best of both worlds.