Dragging trails is tad awkward, you have to do it reaaaaally slowly or else there'll be holes on the line and your workers end up going back on forth on the bits of it. The workers themselves get distracted way too often, even with multiple trails guiding them they still get themselves stuck in random places. I'd suggest to make these last much longer, or have an upgrade that could increase their duration.
Pheromone dust is frankly useless as a)there's a noticeable delay between use and b) the attracted workers will ignore trails entirely in favor of the pheromones, setting them off course. The only use I can see so far is to pull them away from approaching spiders on the surface.
There is no explanation on where to get leg/chitin/venom/shiny things. If these are to be acquired from the hunting ground above the ground, you might want to put a note about it somewhere.
I can see this could be a fun little game