Developer: Panda

Panda released Atari 2600 cartridges in North America, and the site has one of them: Exocet. In this shooter you fly a UFO over a landscape of cannon towers, then dive into underground tunnels whose walls close in as you go. Little is documented about Panda itself, but the game travelled widely: it appeared in Europe under the Sancho label and was later reissued by Froggo as Cruise Missile.
Take the UFO for a spin below in your browser.