To descend down, let yourself drop to the first platform. Run toward the edge, and jump just before the edge. Keep the right key pressed during the entire time. You'll end running down the second platform to the wall. Stop when you reach the wall. Now repeat this for the jump to the platform just below the start. Repeat again. Now, run and jump millimeters before the edge, and keep the left key pressed. This is vital. If you jump before that, you'll either die by hitting the corner too hard, or hit the mine. Then just jump down to the terminal and the exit. Whether or not you get the gold on the left is optional, as there is another easily gotten stash on the next level. When you're done, exit the level.