Atari/GCC’s unreleased arcade Nightmare

Highlights of me getting as far as I can on this difficult game programmed by GCC (Ms. Pac--Man, Food Fight, Quantum). That’s level 76 - the game counts down levels from 99. Has anyone seen any stages past this? The video doesn’t show it well, but when your yellow shield is knocked off, it leaves a rotating red border behind. You can ram into enemies with the red side, one of the major strategies of the game. Also notice that six stages in, hitting the walls enough times with shots causes a knife to fly out at you! Also a bit hard to see, but you start with a 8x multiplier and it goes down when you lose a shield piece. Though it uses Tron controls (a spinner and trigger joystick) I can’t help but wonder if it would be easier to play with dual joysticks a la Robotron. Filmed at California Extreme 2015 with GoPro Chesty mount, and then stretched/distorted to fix the angle of the screen a bit. Full 40 minute version of video has also been uploaded: