hmm i think its a little hard to get on all those high platform.. perhaps a widened ramp or a ramp at the center?

also yeah first expo is so hard to secure with zerg, you will need many colonies. but i dont want to craft theories how it will affect the gameplay.

Ok I made some changes

very cool map!
maybe even allow a backdoor (blocking minerals of the expo with only 48 mins or similar) once having destroyed the ion cannon.

Yeah you should really re-make the back door nat. The gas is not placed well.

Overall i like your map, good job!

playability wise, this map works out well! i'd prefer different deco though to make it prettier (i meant the high plating on the high platforms)