I got past the red room the right way :P but cannot get past the last tunnel the cart goes to.
I have goten physically past the blue barrier and am watching the cart cart go into another tunnel and the place is shaking apart (big thumps and shakes). I cannot follow the cart since I can't quite jump into the tunnel and can find no other way into it.
I have done all of the above to find a way thru. Been in the green crystal mines, thrown all switches I can find, shot about everything, and have goone back into areas already done.