I find the "conquer" part quite interesting. One of the disadvantages of this game is that it's too static. Some interaction with other players by means of conquering island or island parts would be nice.
Or otherwise a new building system that can be used to transfer sea parts in land parts.
On the other hand, isn't new systems just plain stupid? One day of science system and I already see people trading 3000 paper. What fun is there still when you have that many resources?