I don't play mech games much but I still figured out more or less how this works. I think the one major thing I didn't understand was what the red circle selection on the HUD does.
The first missions were manageable. I did not understand how to clear the solar system one. Then I got to the highest building on the city stage and there was nothing there. I had no idea what to do in that one either.
I recorded my thoughts, but unfortunately the game spontaneously reverted itself to fullscreen when I started and that appears to have messed with the recording.