I think, as a patreon (<3) that I'll be ok with you publishing a public demo a bit after the patreons get it (maybe 2 weeks after or so?) - just don't update it, or always make sure that patreons get the latest and best - so called.. otherwise it's really not cool if someone gives you 15 or 100 $ and gets 'nothing special'..
but yea, you guys do seem promising. wish it was something to share with friends xD