RTS with a full focus on macro where the micro is fully automated? Pretty interesting!
First of all, detailed tutorial with fluff, dark AI humor and even options, much appreciated! (playable bug swarm faction when?)
Mechanically things work fine, good graphics with sound effects and fancy explosion death animations and construction by stages.
One thing that feels really missing is some sort of basic tower/turret. As pointed out, right now you need to rush out buggies otherwise the enemy buggies just rush you to death. There's a reason why virtually every RTS has some sort of tower option (or many). You could then add siege units that prioritize attacking towers, just like you have the saboteur that focuses on targeting the miners (also a reason to tech up to air units). I would even say the starting main building should have some default tower, so there can be more focus on expanding and taking control of the map's resources.
Another minor suggestion, some way to automate production in buildings, so they constantly pump out a specific unit while you have the resources?
Still great work all-around, being released from the stress of microing units in an RTS feels quite good!