Three Oceans

This is game for my graduate studies and It's a turn based strategy game

In this game, your mission is grow up your faction's by taking island, and destroy the others faction.
You gonna start with one ship and three champion to explore the ocean and take other faction's island, every island gonna give you a amount of currency each turn.
Also you can improve power by unlock technique, hire new champion and make new ship, each ship gonna take 2 party when travel
The point of this game is diplomacy (like Total War franchise), it's can be war, allies, trade,..

This is just like a demo or first look so don't take this as a complete game, leave me you option and how can I improve my game.
Appreciate for spending time, thank you!