Is there like a lot more content in the patreon version?
Almost supported his patreon before I noticed this thread is 3 years old and the game only has like 65 images, I thought this was like a newly released demo or something.
I'm not qualified to tell you if there is though as I am not a patron myself, but based on the latest update on the patreon (0.8.5 version), it mentions that "[Slave Crisis Area] has completed chapters for Wonder Woman, Power Girl, Supergirl, Black Canary and Zatanna. Bonus chapters have already been installed for WW and SG and the new 8.5 build now has a heroine training storyline for Black Canary."
So there's the addition of Power Girl, Supergirl, and Black Canary as well as bonus content for Wonder Woman. If that's worth it, I dunno. You can look at the posts on their patreon to see if their designs for those girls are worth it.
Also, the author of the thread is the creator of the game. They don't really have an incentive to update the main page with the Patreon Build of the game except that the demo might deter people from playing the game due to the perceived lack of progress when the game creator only has the free version of the game up.