I think whoever is rating this map is a bit harsh. Sure, it's not hard to beat, just build a brick-house full of reactors on the PZ.
Fly a guppy to near the Spore tower and kill it quickly (I manage to do it while it's counting down).
I use about 30 or so Bertha's to mostly focus on the central area where the inhibitor is. Eventually they beat the Creeper down enough that some AC gets there and one can build a nullifier. Then set Berthas to Auto-target and let them clear up the remaining creeper.
There is a bug in all builds up to this one. I reported it and Virgil has rolled out a fix that will be in a build at or after 1.59. It manifests itself as a freeze in the game if you pick up multiple shield keys simultaneously. So when you fly two CNs out to the top to pick up the shield keys, be careful how you build the collectorst to connect them. Make sure you pick up one at a time.
If you have the game frozen, loading from a save can unfreeze it. You may need multiple save/loads to finally unfreeze it.