Honestly really good animations, the way character looks towards the camera is a nice touch.
But time to critique:
1) combat anim. are way too slow, its a classic mistake making-souls like combat, it should not feel slugish. Try to watch a video from of soulsborne games how fast/slow are players and enemies attacks
1.5) More attacks. Heavy and maybe 2 simple combos would spice it up
2) Dodge and run should not be on the same button, atleast give an option to have seperate buttons
3) I know this is a demo but player should be rewarded for accomplishing something, not loosing. Many adult games have this problem
4) "I'd like to develop it into an open-world game" This is a mistake. So many game devs gave up or failed miserably. It will end up either empty or straight up incomplete. Unless you figure out how to optimize it really well, seeing the current build as it is will make the full game unbearable.
remember a golden rule: Sometimes less is more
4.5) The enviroment is a bit too big. Unnecessary, Eats too much performance