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I'm stuck in this exact same place. I got the forcefield unplugged and got to the crate of clips, but I still don't have a gun and there's nowhere to go unless I press the button on the pannel. But that only expands my options a little, and then inevitably some combines show up and kill me because I have no way of defending myself. Where do I go from here?

EDIT: Ok I found the door in the floor and destroyed that thing by putting the barrels in it and then I pulled the plug on their portal. Now the messages are telling me to return to the top of the central shaft...just what IS the central shaft and how do I get to the top of it?

EDIT #2: Nevermind. Finished it.

I'm stuck where you unplug the forcefield.. As in I can't find a way to unplug it.

There's 3 supply crates which of course I can't break or throw far.. and nothing else moveable I can get to :(

I'm hoping the way on doesn't involve crate stacking as I can't make them not fall over when I try to jump on a stack of 2 let alone 3.