What an adventure! You could turn this into wall art or a board game - survive a shipwreck, escape the shark, find a safe harbor, beware the cannibals, take a nap, flee from the erupting volcano, don't get swallowed by the whale and find the buried treasure! Very fun design!
Charming idea - and one of my votes too - as I love the two-sidedness ("invite your friends", "deter your enemies") which is perfectly suited to a door hanger!! And I really like the way you've used your color scheme to illustrate the concept again, very clever in a nice subtle way. One tip for instructions on the printed fabric: I recommend the bottom left hand side as that way people will see them when they look at the swatch view.