At the start, immediately walljump upwards (chimney jump if possible), and leap over the chaingun drone. Get the exit switch, then drop down into the entrance. Grab the door switch on the ground, and then hit the vertical launchpad and the bounceblocks to get the two door switches on the top. Fall down and grab the second door switch on the ground, then use the diagonal launchpad to get the last switch. Drop down and get to the exit. Be sure to hurry though, because once the second chaingun drone is able to see within the industrial zone, the level becomes very difficult!