Currently the "full" version is on Patreon. We're still working on things every day!
I can't answer that myself. I am 99.99999% sure the $30 patreon tier would definitely get you access (that'd be a dick move if we didn't IMO but I dont make those decisions. Snaurz isn't a dick at all so hence why I'm 99.99999% positive you would)
As for the $6 tier, that gives you access to the current "full" version of the game and discord access. Whether that gives you the full game on release, I have no idea. We're about a year away still from 1.0/Steam