In the game, you'll have many things to work with such as your shields, your hull, your ship laser, and of course the enemies. The shield absorbs minor hits to your ship, but it can't take constant blasts 1 after the other. The most important part of staying alive is your hull, keep this from getting damaged.

Instructions:

Use your Mouse to aim and Left Click to shoot.
Hold the Left Mouse Button down for a while to charge up your laser gun so it can wipe out more enemy ships.