Assault
Assault is a fixed-screen space shooter for the Atari 2600, developed and published in 1983 by Bomb, a small company based in Asia. An alien mother ship hovers above you and keeps launching smaller attack craft, and you have to shoot them down before their fire wears your weapon away. It borrows a lot from games like Galaxian and Demon Attack, but its ability to fire sideways as well as upwards gives it a feel of its own. You can play it here in your browser.