I've not even encountered subtypes since I started playing this week. It feels weird and confusing because it's bad. The grunts are zombies, there's flying mercenary Boba Fetts, the general tether is that they are cthulu-esque squids, but then the main overships are 1950s flying saucers. It's just a hodgepodge of ideas that fall completely flat, both because those ideas do not work together, and also because what they're ultimately designing is an alien humanoid faction - which is not as fun to kill IMO, and also directly contradict the concept that Insects and Robots are (facially) ravenous planet-destroying invaders, but secretly sentience fighting for survival. They're clearly humanoids that think and feel and build spacecraft. The robots already fulfilled the niche of humanoids (combat-wise) but are more threatening, aesthetically coherent, and make more sense for the concept.