Hey, glad you enjoyed the recent patch!
Buying the paid version will guarantee you access to all future "RC" releases as soon as they drop. The public "RC" versions are currently delayed by 3 weeks from when owners get it.
You'll also own the full 1.0 game at a discounted price by purchasing it now. Eventually the "Public Version" will be converted to a (somewhat lengthy) demo.
And of course you'll also help directly support continued development of the game!
Note: Snapshot releases which signified with "s-1, s-2, etc" suffix are exclusive to monthly Patreon/Substar supporters.