I have been a sailor from age 14. It is in my blood. I went to school on a large sail ship. My father, and all fathers before him went to sea. It feels like home and the waves make us sleep better at night.
The silence of a city house drives me crazy. I like it when the floor moves up and down and left to right. I personally grew up with a giant diesel motor next to my bed, and slept like a baby. I am old now, and all I have is books, piles of books with ships. I long for the old days but I know that never comes back.
What I like to see in this game is more color. Everything is either blue or grey. The map is boring, and could use some art to it.
Having a map like in the old days would be a major improvement. I also suggest you make it bigger, so you don't bump into other players every second.
Here is an example: