Wow! That really does look bizarre. Completely obscure what the hell is actually going on there.
I tried to write up an explanation but it was getting really long winded, haha. It is pretty deep for the atari days. It's fun, but more than that it really puts you in a weird state of mind because of that relentless droning.
At the time I wouldn't have said it was my favorite, even though I played it more than anything else, but looking back it probably was.