This is one of the more addictive games I've played! After a while, you essentially get enough soot sprites to completely maximize production with as little loss as possible. I was a bit confused by the UI at first, as I didn't realize what clicking on the different elements did and what some of the upgrades meant, but I got the hang of it by the second round or so. My high score is 112 baths given, 12,240 total gold earned and 2681 coal burned!