Heres a WIP label art for a new Atari 2600 game call Alien Greed II. AGII was made but that same programer that made the game Melbourne Tatty - [link] the story on the game play are,

Cartridge Collecting Level:
Run around the screen collecting the cartridges before the other Alien Collectore beam them away. When a cartridge turns red it is being transported. Another second and it will be gone. Watch out for the Bee. It won't harm you but it will slow you down.

UFO Maze:
Fly your damaged UFO to the next level by making your way to the exit. Don't touch the walls or you lose a life. There is a rare cartridge somewhere in the maze. You don't have to get it, But it is rare (And worth more points).

Boss Level:
Atari Charles is protecting his E.T. Prototype. Grab the cartridge without getting stomped.

Here are some screenshot of the game:
AGII Title Screen - [link]
AGII Cartridge Collecting Leve - [link]
AGII UFO Maze level - [link]
AGII Final Boss Level (ET) - [link]