Hmm, for Difficulty of Mission Two. Either add more Anti-Air for the Zerg, or take away the player's ability to use Air. I just brought in like 5 Void Rays and completely steam-rolled the entire map. Noticed there was a ton of Ultralisks standing guard though.
Gonna test the Third Map now.
Dunno if this was fixed also, but when I tried Mission 2 on Normal, seemed the time was a bit quick for either destroying a Hive / Building Pylon to repower the three warpgates. And then when I checked the immediate north of my base, I saw about 50 Roaches. Dunno if that was meant to be there, or if you forget to give them the order to attack after spawning / put the point to attack being too high for them to begin attacking your base.