tip: immediately expand once you kill all the first wave zergling, dont bother gasing at all prior that. once expanded, start to gas. and lift off ur rax (the initial placement? 1 rax 2 depot?) and techlab at the bottom entrance. build a fac and tech lab it. you've just completely blocked the ent and can gg any incoming waves. get 2nd rax and 2nd fac to tech lab. once you saturated the expac min (transfer worker, and build scv from BOTH command center) 3rd rax with reactor. once ghost reaches 8, spam marines.

for muta inc, snipe. ultra inc, snipe. spam that snipah battan.

i scored it in just less than 5 mins... like 4min 50 sec or some shit. lol. (aka ample f***ing lots of time remaining LAWL!)
and it COULD've been faster if i 4 rax and 2nd reactor.