Enemies, naturally, take the form of bugs; and at this size, they might as well be dinosaurs. Borderline-microscopic critters (like the aforementioned aphids) are the size of small kittens, and ants are the size of Big Cats. And those are just the first few foes you’ll encounter.
It’s basically gotten to a point where I don’t feel like I fight enough sometimes. I find myself initiating combat when I don’t really need to, just to get the experience points. I’m basically a ghost, picking and choosing the times I bless the enemies with being able to see me.