To be honest there isn't too much to the game besides knowing when to stop accelerating so you don't waste gas for things like when in the air or the slow motion parts. besides that its petty much just keep going and upgrading every run with whatever you get.
Thankfully playing of Super Meat Boy has made this game trivial in comparison. I think the skip two levels after every five though is too lenient, in Super Meat Boy it was skip two per twenty.
Very interesting game. In case this helps someone: Saving a little for the flag can pay off later. Also, since this is a bullet hell game (more so at the later parts of the game), speed is more important than attack (although you should find the right balance).
Hmmm, it seems that a quest for the achievement wont update when I complete it, I did the New Game+ and completed the quest again, and still no dice. Anyone else having this problem?