Gutted the demo version? The demo version wasn't meant to be "here, you can play 90% of the content for free!" It was supposed to hint at the content available in the full content builds which it's still doing by showing some post-ISA content as well, but not in a linear way that would remove any kind of reason to even consider supporting the game because most people aren't going to pay for something that offers the same thing they can get for free.
There'll be a full 1.0 release next year on Steam, so people who don't want to deal with monthly subscriptions on Patreon will be able to buy the game once. Anyone who supported me enough to pay for the base price of the game will also be able to request a key, so I'm not sure if what you're complaining about is maybe not being able to play the full game for free?