A free program for Android, by Gismart.

Idle Port Tycoon – Sea port empire is a game in which you will become the captain of the most famous seaport in the world. Build and upgrade a port to create a powerful defense against aliens. 

In this ship game, you must keep on tapping and building your port. Tap on containers & cargo, load them up, transfer those cargoes, upgrade, and win!

You must keep on working on building and upgrading your port as well as your equipment in order to be powerful and surely defeat an alien attack. As you progress in the game, you gain materials and expand your empire. So keep on tapping and be the hero of the earth.