Hi,
I owned for a Time an Atari 800 XL and i remember that I have played a Game that looked like Crystal Castles or Pac-Mania and a bit like Miner 2049'er (When you finished a Level you go one Stage up, and if you loose one Stage down). You must collects Dots and the Game looks Isometric and was Colorfull. I remember that this Game was really awesome but that could be 'The Cinema in the Head' too
I hope my English is not to well,
Bye, brabel