Looks pretty good.
Some questions concerning that video
1. It appeared that the US player had access to a lot of precise information about the Japanese ships. Are there inaccuracies (fog of war) implemented?
2. Do the ships have a realistic munition load? It seemed that there was a lot of shooting from long range with low solutions. There was a finite number of shells on board and one did not want to use all of them in one battle. Conserving resources was important.
3. I wonder why the player chose to engage the last merchant from such a long distance. It seemed like a lot of firepower used to sink what seemed to be an unarmed merchant.
4. Maybe it was just the changing camera, but it appeared that there were instances where ships were firing at long range during a turn. I don't think that would have happened too often as it would wreck the solution and waste shells.