This game has been discontinued. No more work will be done on it. So, features such as enemies attacking (Yeah, I read all of your comments) will not be implemented. Use the mouse to move the ship and press the left mouse button to shoot at the enemy ships. You can only fire one bullet at a time.
Galaxian is (C) Namco 1979-2013. Sprites were taken from Galaga 30th Collection as well as the SFX. All code was original. Have fun!