how to beat game without a single turret: barrier ring, and rebuild as soon as a barrier gets destroyed. if you time the "b" button right, building a barrier will take literally no time at all. AND spending so much time building lets the CD run LOL(bug: CD continues in pause/build mode)
actually. once you got the hang of it, a hang glider can get you to 380K in one go...first toss, then burn the three turbos, bonce on dolphin, then when youre at the highest point of your flight(can tell by seeing your dwarf in the exact vertically middle of the screen), then use hang glider