Looked fair.
I did not notice any lag issues as mentioned by previous posters.
Anyway, I did the tutorial then started a skirmish with 3 computers on easy mode. While I was at no risk of losing, I didn't see any chance of winning. I sent 54 ships from various directions at defense planets and that failed repeatedly. So, I went after a rocket planet and that also failed. So I tried a normal one, which also failed. I switched over to using rockets myself on a few key points and while that helped, the now neutral planet was instantly swarmed with enemy ships and the cycle repeated.
I guess, I'm not really sure what I'm doing wrong.
Anyway, I really like the idea. I've played something similar years ago and loved it to pieces. I'd suggest adding in a tech tree of some sort for upgrades (maybe research planets to fund them?), more ship types... maybe races with perks (Humans generate a few extra bucks, X generates a few extra ships, Y generates a few more whatevers, etc).
Thanks much =)