Hey!
Sorry for the extremely late reply. I'm embarrassed to say that I slightly forgot Itch.IO existed. In general Patreon or Discord is probably going to be a faster way to contact me.
The $1 Patreon level just gives access to patron-only images (any time I post an NSFW screenshot that Patreon won't let me show to everyone).
Stationmaster and Exalted are both available for Patreon supporters, though development on Exalted is mostly paused because I pivoted to Stationmaster 2.
The public build is pretty old, and there have been a lot of new features and improvements since then. I don't know exactly which ones, but the difference should be considerable.