How to play
This looks to be like a Galcon clone (I think) which was, interestingly, the AI challenge a while back. Looks like the way you play is:
You are blue and your enemy is red.
You click and drag the mouse from one of your blue planets to another planet to battle with it. The one with more ships of whatever wins and will take the planet.
You will spawn ships automatically. The more planets you hold the more you produce.