Hello! Developer here! So... The demo was outdated. We created it for the Kickstarter campaign (Summer 2019) and there were many inside-jokes about it (like "Please donate if you like the game!" and similar). Furthermore, the full game changed lot of things, especially aesthetically (we moved from a pure 2D to a 2.5D game), but also in terms of game-design (totally different inventory and UI). So, all in all, we thought that the demo was old and having no more purpose. Regarding the release on Itch, it doesn't depend on me but on my publisher. I'll ask what he thinks about. It's not excluded that we'll release it here too.