To my inexperienced eye, it almost seems like one key element of this exciting game -- namely: researching the appropriate defense to match enemy attacks -- could be broken in the following sense: It seems as if top players build fleets of ships composed entirely of fast ships with extreme firepower and no defense, because defense is not needed if you fire the first shot. If you fire the first shot -- and you will if you are the attacker -- with extreme firepower, you never need worry about receiving damage.
That seems to me to be suboptimal. By always allowing the attacker to get the first shot and having his entire fleet be able to fire before the enemy, an important and fun element of this game becomes marginalized. I think this is a flaw, which, perhaps, could be addressed by changing the way in which initiative in battle is handled.
Your constructive criticism and input is welcome, thank you!