I like that. Maybe like a purple water tile that represents a blob of contaminated water. Its surface area determines how much pollution is emitted and how quickly it dissipates, and also the "capacity" of the blob. When the "capacity" is reached, it expands by another tile, just...

Picture this: Chemical plants that use water produce toxic wastewater as a byproduct. Water treatment as a chemical plant recipe, turning toxic wastewater into solid waste product. Assemblers that use fluids produce solid waste product as a byproduct. Three additional levels of landfill containing d...

I noticed you've got "Assembling machine - set recipe" in that list, does that include "read ingredients"? That would be a really useful complimentary function. You could just stamp down a block complete with train station, set a single constant combinator, and off it goes.