I have put the Witching Stone Demo on Steam!
It's a small button on the bottom right somewhere.
https://store.steampowered.com/app/2693530/Witching_Stone/
It can still be played in-browser on itch, too.
https://tayl1r.itch.io/witching-stone
Edit: it is no longer a small button, I didn't realise I had to control that
