Not a lot of comments as of yet: you're going pretty well and your bases are covered. Eager to see more.
Only point of attention is the cliff on the top middle section on the third picture, next to the arch. Because of the way the shadows work in your map that border is currently a bit unclear - you may want to make sure to make the more obvious with a doodad or two as things move along.
The idea is that it's a shadowcore(moebiuscore) laboratory from after Legacy of the Void.
They have started into making their own swarm, and are experimenting with new strains, and even making their own zerg creatures, all obeying to their will