I found it by looking up another Atari 2600 game that I liked, called Demon Attack. I was looking at some images of it, and I saw the cartridge that it came in, which had a silver label, with a rainbow-like strip across it, and a triangle shaped end.
I then remembered that the other game also had a very similarly shaped and designed case. I looked up the company that made Demon Attack, found it was Imagic and that they were known for their oddly shaped Atari cartridges.
So then I found a list of every Atari 2600 game made by Imagic, and looked up some info on each of them, and found Cosmic Ark.
