The demo has just been updated to version 0.0.0.19, which contains:
Added Save/Loading support for physics Ore Pieces
Updated AutoMiner to remember it's On/Off state when loading save file
Updated the Lamp Pole to be cheaper
Fixed small building crate collisions being slightly smaller than the actual crate
Fixed a bug where your blast furnace could get infinite resources if you pressed "Clear all physics objects" when the furnace was overflowing
Fixed Crushed Ore sometimes falling through the Ore Crusher, onto the floor below
Fixed Ore Analyzer not saying if things are Polished, only if they're Dirt/Unpolished
The highlight is new support for Saving/Loading physics ore pieces. This is a big change, so please let us know if you find any issues with it. We read all your feedback on Discord and the Steam Forums. Thank you for playing the MineMogul Demo :D