I imagine you thought of all these, but: 1. From the overdraw image it looks like you're drawing your sprites as quads, regardless of their shape. You could try fitting a more complex polygon to each frame of animation in order to have a tighter fitting mesh in order to not draw quite so many fully ...

Flying logistics bots are boring, I don't use them except for resupply and I would not mourn their death. I'd be okay with logistic bots if they ran on a belt-sized rail network, though.

I don't mind the biters as an occasional thing to deal with, but I do think that as the game progresses from crafting/survival to logistical challenges and factories the solutions you use to deal with biters should progress likewise. Clearing a biter field should also be similar to setting up a mini...

Considering the path finding optimization. How about making a gradient map that would guide the biters. When they attack, they always go to the same target, the player base, and that does not move. You could grow a gradient from players structures outwards, for a precise solution. Or simply from th...