Hey thanks for the free game + the codes buy how do you use them?
Also here are my recommendation for improvement:
1) Remove that water background, imo it looks ugy.
A wallpaper like this: http://www.youtube.com/watch?v=nMUbSM_5zpM
skip to 4:00 would be better
Or even a solid deep blue color would do
2) I know your going for a 3d thing, but oblique angle makes tactics a but hard. What I would suggest it having the actual tactics part such as placing your ships, and where your going to attack to be in top view, and even 2d if possible
3) This leads to my final point that I think the attacks themselves should more the part where the 3d shines. Maybe put some time and effort in making them look nicer.
Anyway, that is my feedback, hope it helps.