UPDATE
the final game screen is the path choosing a screen, basically, after the player exits a zone he can choose which zone to visit next during his journey, each zone will cost him one day, after all, days are finished he will only have the option(also he will unlock) final zone.
Note that during city travel he will use fuel.
With this design, I think we can extend gameplay time to as much as we want with the condition to have enough random pool content not to become repetitive
