Thanks for playing! Unfortunately, tic80 only has 1024 bytes of persistent save memory, so it's not possible to save the state of your factory given the amount of game objects that would need to be stored,  not to mention items on belts, inside machine inventories etcetera. I could possibly add an option to save your research progression, but that wouldn't fit under the original intention of the game, which was to be a simple (as possible) demake, with an arcade-style session in mind. I will look into the bug you mentioned as soon as I get the chance. Thank you for reporting!