Absolutely fascinating game. I love your concept to pieces. I think that your initial configuration could be made a bit kinder, at the moment it's really easy to accidentally lock yourself up by pushing your rails into your railmaker, and it took me entirely too long to figure out how to get anything to the refinery, because the only way to do it at the start is to configure your core to send it that way. Also, it's really hard to send specific quantities of items towards certain machines.
I still, however, am quite interested. It's an absolutely lovely premise and "Rust" is an actual really threatening cool thing here. Serious kudos, and good luck!