I got 83.M by doing the following: I selected maximum bombs and health in options. I selected the ship with the highest attack and the vulcan cannon that aims, and mostly made up for extra points but getting in close and killing bosses faster. Notice I could have used one bomb each boss fight and been ok.
Here is the video (wait a few hours for the upload and processing to complete):
Note: I tried using the diamond blue laser weapon (as suggested in the other solution) first, and only got 77 million points: