Added pic and some missing info, who is the author? I am not sure that creep colony will be enough for zerg to cover both the nat and the ramp, and then of course there is the extra choke (I would at least place a mineral block there and modify it so that it will not mess pathing). Because of the wide ramp and double choke will also be difficult for terran.

Gas issue in the red main.
modified by Lancet