...... Duno what to score
Ok man but it needs more things on it.
Missions, do the flags significative in any way, getting items or some secrets arround, faster gold (Game is too long for being always fight-getmoney-spendmoney-fight all the time).
Taking towns also should have any usage, and maybe nations could seek you if you pirate them or .. well
VERY IMPORTANT RADAR ON BATTLES or smaller fighting place because it gets BORING very BORING when you cant find the enemy ship for some minutes.
All those things belong to you. The idea is cool anyway, so i'm not giving a bad score. Please do a 2nd version or something. I like your games, played some of them, and I know you can do it much better.