Shadow Empire: Oceania DLC Global Steam

All is possible

Make alternate Earths and even Waterworlds. Planets have a lot of islands or only a few continents. The new areas developed by the Oceania DLC drastically alter the game's feel and ambiance. Yet, it significantly alters the gameplay and forces you to play a new kind of game. 

Furthermore, the current land-based Traders have a more structured relative in the sea-based Merchants, known as Maritime Trade Houses (MTHs). The MTHs will enable you to explore the oceans and gain Transport Contracts in order to invade and/or maintain supplies moving between continents or islands. The MTH are quite commercial, and it is also possible to buy their shares. After you have become a shareholder, you may utilize Policy Meetings with the MTH to influence their opinions and dividend distributions.

About the base game:

Shadow Empire is a deep turn-based 4X wargame with a unique blend of military focus, procedurally generated content and role-playing features. Shadow Empire places you into the seat of the supreme ruler of a small nation. Destiny and greatness await if you succeed in reconquering a devastated planet. Plunge into an alien universe and explore another world in a dark and unforgiving future. Take command and engage in great military conquests and delicate diplomacy. Control your nation’s budgets, recruit and manage governors and commanders, build your economy and infrastructure and much more.