Thank you so much for playing our game! Yes, you have to deliver the packages in your inventory on the top left to a house with a mailbox matching the color of the package! it doesnt matter the order of delivery as long as you get it delivered and you have to plan the path to deliver all the packages! You can only carry 3 at a time, so when you start getting more packages (they appear smaller below the packages in your inventory) it means you have to stop by a post office when you free up some space in your inventory to deliver them!
We didnt have time to make a proper tutorial, but in a post game version we'll make sure to explain the mechanics better in game.