After about five months of playing adventure mode, was finally able to start at level 12-1 and proceed to the end! The first time I got to space, I whiffed, so the second time I got there on my last life, I saved the game, and practiced on gauntlet until I was able to hit sungod 8 on the stage.
And now I was able to do the whole thing in one game, final score was 1.32 million... the PC version doesn't have achievements, but I'm still tempted to try for 2million. Hear that is an achievement in the console versions.
Finished up with 7 extra lives. Lost lives on several boards in the 12's and 11-6, and one in the 9's.
Finally hit sungod 10 on gauntlet. The trick is constantly stopping the advancement forward by making two of the same color connect, even if they don't disappear. At that level even the 'zuma!' exclamation or reverse balls don't last more than a second.