Space Galaxy Shooter.

The Hyper-ring was constructed to defend Earth from alien attacks by seeking out hostile home worlds and annihilating them.

Warping to a destination the Hyper-ring surrounds its target and allows a small craft the power to attack.

Humanity is under threat, proceed and engage the onslaught. Your ship will automatically fire and you can control the speed and direction of your ship, either clockwise or anti clockwise. Be sure to make use of the power Ups to help your cause.

Enjoy it.