Adding to everyone else’s sensible comments, 14K words is the size of a hefty short story - it’s a very decent length for a demo. If you’ve established what your game’s about and some of the characters, and give a sense of where it might be going, that’s great to start with! People will always want more, but if they want more because they’ve got immersed in your world and want to spend more time in it, that’s a good thing.
Best of luck with the demo 