Silicon Zeroes
pleasingfungus.com
pleasingfungus.com
The dev said they would look into it, but I probably wouldn't notice or remember to look in the future.
I am told that the game works fine under Wine, fwiw; otherwise, I'd suggest checking back in a few weeks! Set a calendar event :P
I also think that some of the visual programming languages should take some hints from these devs. I haven't seen one work as nicely as this and I've tried/worked/watched a handful of them in reality (PLC programming, and teaching kids).
I'm not sure what you mean by 'three types of null', though. '-' is null, '?' is NaN (which is kind of similar), and...?
Great idea
Nice flattering comment from SpaceChem/TIS-100 author!