I'm sorry for the confusion, but the demo available here on itch.io is specifically a free, public demo with limited content, and will not be updated with more content in the future. Crisis Point: Extinction is a paid product and I believe the demo length is more than sufficient to decide if you want to buy the full game and support us; if you've defeated the tar boss at the top of the Summit, you've seen more or less everything in this demo.
All the updates I post about are only available for our $10+ supporters on Patreon, while the game is in development; once it's complete, I'll definitely be selling it on itch.io, but until then the only way to get the most updated versions of the game is through our Patreon. I hope that clears things up for you!