Invaders Core Windows game

Invaders Core - this is a game inspired by Space Invaders. We're playing for a drones, controlled from the main ship core, make money and capture the planets.In the game a variety of weapons and customization of the ship, which affects on ship characteristics.
I am currently working on the mechanics of the game, not the graphics part.
Now it looks like this:

Now I'm working on customization and game progress. I am glad to answer any questions about game.