Huh. Weird. Once i got to 1090% demand and system got nail and iron bottlenecked both ying and yang started counting up together every other second. I guess there's some sort of "z-fighting" shenanigans going on with the yingyang math once you're in that state, only proving that this whole mechanic is sorta way up there. It can't be the intended math... but who knows!
If you turn off nailbreakers and you starve nailmakers for a few seconds and they drop to 0, you can turn on breakers and the makers still see and show 0, untill you kickstart the math with "buy 100g iron"
Overall this plays like a creepypasta, but there's nothing else behind it. You really should add some intentional glitches, like factories and makers turning off once every 10 minutes and sell the solution to that as well, and cryptids to this and make a new legend.
Its not bad, but for what its trying to be with the inspiration, you might want to read some psychological horrors and draw from that. The paperclip game actually became real once the music started playing.