It's a cool concept, but I would have loved a little extra challenge or variety of some kind, beyond simply seeing what a customer wants and giving it to them before time runs out. Maybe a destination could become unavailable if it's already in use on a portal, so you have to strategically prioritise things a bit more. Or you could choose to send multiple people into a portal if they both have a destination in common - sacrificing a star to save on time.
I also wasn't aware you could put multiple destinations onto one portal, so showing two empty slots above the portal could have made that clearer.
Otherwise, really solidly executed game! I especially love the art style and world-building. Well done :D