Tip for 6000 ft: The following strategy from a previous post definitely works: "Accelerate to 200mph. then wait for you speed to go down to 75 and accelerate again to 200. Make sure your resistance is 3% Repeat till you run out of boost and you should get it."
DON'T USE YOUR HINT ON THE LAST LEVEL. That's the one with the two people looking over a city. It makes it so that you can't win the game, for some reason.
This game is broken. Every once in awhile you start to die no matter what you're doing. If your expanding ball hits a wall: dead. I just died because it was killing me everytime one of my expanding balls hit any other of my previous balls. CRAP! FIX IT!
Search on youtube for gemcraft first epic level. Theres a video that shows you a good way to do it. I tried it and beat it after 3 or so trys and I hadn't been able to beat that first epic level for at least a month before watching that.