I love what you've put together so far! I've played through the demo three times and beat it twice. Found it via Jesse Cox's playthrough. I think holding off on the Steam page was a good move. It feels a little too underdeveloped at the moment, too in flux.
If I could make a suggestion: it might be a good idea for it to be clearer that we can freely change where adventurers are positioned. I saw the arrows when clicking on an adventurer, but I assumed it was another way to change which adventurer I was focusing on. I also ran into a bug where the game would occasionally freeze. I don't know what in particular caused it, but it happened a few times per playthrough. Not too big of a deal though since I just had to refresh and things picked up more or less where I left off.
I am very much looking forward to seeing where you take things! Good luck!