I've gotten over six million on this game, but that might've been as low as difficulty level 3. I regularly crest a million on level 5. But ten....damn...it's rough.
Just now I got probably my highest score on this difficulty. It was about the fourth or fifth consecutive game (and possibly my first time passing the tank screen), so not a lot of time spent, but it was a lot of work. (This was blue/green. I don't remember what set I got my high score on.)
The shots are so fast - especially on the tank wave, where the quarks themselves vibrate as they fly - let alone that your shots seem slower than ever, I swear they're not even reaching the boundary of the screen at times and they're not hitting anything!
What strategy can one have here??
(This is probably best posted at TG, but I know there are some phenomenal players here....)