Lag ruins it.
For something so processor heavy, you should consider simpler graphics styles. A game like this will only ever be fun if it is smooth, and fast. I found the first one on minimum graphics much more fun.
I mean, i've got a pretty buffed up pc, yet i still have to turn the graphics right down before this runs mostly smoothly which completely goews against the point of the pretty graphics in the first place.
You shouldn't be aiming your flash game at people with Octocore, 256-bit, 250 GB RAM computers from the future.
A game like this would look beautiful with just a black background and a basic white, wireframe background, and it would take much less time. If you change this game to something like this, please, pm me, send me it and i'll finish it, multiple times. This game is fun, but it is just so hard to run, especially in later levels.
I was so disappointed by this, because the concept and physics is incredibly enjoyable to play around with, your just aiming too high with the graphics.
Please, rethink your graphic style, please...
(but still 6/10, 5/5. Bloody good game. Damn good effort. This deserves front page, you could use the criticism and awareness)