Is the demo meant to end once you get to the witch's house? It showed me the scenes about the hero then returned to the world map and nothing more happened.
No! that's so odd! Someone went full playthru here: https://www.youtube.com/watch?v=2IyQaahzXuQ&t=1025s
So yes, this was patched version of demo as game is still in closed beta, there are bugs and some weren' solved. Sorry about that! I will surely upload a new version when it will get more stable.