All my homies hate grunts

Interesting

The enemy only having grunts makes you choose a bit of a different build order than usual which is appreciated. 

Attacks in early game were much more severe, after that the mission drags a bit. They still build lots of grunts, but seems like they won't attack. (Probably the AI is set to default land attack and waits til it has a certain number of axe throwers / catapults before starting their next attack which never happens)

Tech being locked behind rescued buildings is a bit weird, if you lose them they are gone for good. It did work because attacks started to stop, but not sure if that would work out with continuous attacks, would be hard to defend them as they are spread all over the map.