Tip for the hard wall climb... jump to the left; continue to hold the left key; hit the jump key again; THEN press the right arrow. If you hit the right arrow before the 2con jump in the air you won't make it around the ledges.
use health pack at the end to top off your health. Give you more gold at the end of the round. You can even wait for the regen on the health pack as long as only enemies are shooting at you. Just don't shoot back and wait on the regen. no timelimit!