Hmmm, only other option then is boosty or ko-fi with the current game build on it. Here on Itch.io though you shouldn't have to pay anything for the demo. Just the current version of the indev game is only available on patreon, boosty, or ko-fi. But like I said, it's not a complete game just yet, I'm still working on it.
https://ko-fi.com/silverearsentertainment
https://boosty.to/silverearsentertainment