Also, this game isn't meant to be played in one sitting. Unlock planets, save it, close it out, come back later to artifacts, and check out all the stuff you get. B)
I figured it out! For every artifact, you get extra dust on NewGame+. If you found Niburu, it STAYS after NewGame+, and the EXTRA dust STACKS on top of what dust you have! And dust shop carries over from EVERY prestige!
selling artifacts scale to the amount of money you have. If you get REALLY, REALLY slow [one number per 3 minutes], just sell a poor artifact... you'll get a 30% of total money boost.
If you use the fastest set that consumes a lot of fuel, you'll be going so fast that it's technically more efficient than a full econ set. [Light Head, Light Body, +220 POW engines, +110 POW booster, Forsage]
Killing time badge is near impossible since the game controls are somewhat jerky, due to the frame-stabilized 30fps [read: it varies between 24 and 27 to prevent flash from 'stuttering' but that no longer works since flash 11.]