aargh. The first time I tried that jump on your diagram, I made it but was killed by one of the flying balls... now I can't get it to work again! any further tips?
I finished the game. @billibongusa, you must shoot the white robots to get the yellow laser.
I don't remember where the double jump pack is. Sorry. There is an item somewhere that allows you to slide while ducking. That is how to get past the one block rooms, but I don't remember where it is.