Hello there, I tried your demo and let me tell you I just loved the art, particularly the Gorgon so congrats on the work!
I'd like to offer you some of my impressions, and suggestions:
1. I found the mapping somewhat odd, I get it that the area isn't added until it has been fully explored but these huge vacant rectangles seemed ugly for lack of a better word. Personally I think that a heavily shaded preview of a visited area or smaller rectangles would look better.
2. Given how huge the map is (despite it being just a demo, its breath really surprised me) the character indicator is rather hard to see at times.
3. I found a bug in one of the slopes, it's next to some stones of The Mire, I think, since the game doesn't allow you to walk off ledges the animation kept clipping until I jumped off it, in my whole playthrough this was the only instance of this that I found.
4. The lightning that begins in The Mire is rather jarring, having the whole screen turn white also hampers the combat and platforming, perhaps doing it only once or twice and then just a slight flash?
5. I didn't like the vibration on grabbing ledges.
6. I found that if I jumped and the character was spinning it would fall through the ledges despite having clearly jumped high enough.
7. I'd like it if you were able to pick up thrown axes that hit nothing to recover them.
8. There is a transission of areas, I think it was from The Hollow to the next one were the whole screen has some fog and then abruptly it's gone.
9. After beating the Highway Man I came to a sign and when I tried to read it it caused the game to abruptly close.
10. Consider adding the chance to change the direction of an attack, I had to do a full stop before being able to change the side, this made dodging and then attacking or attacking multiple targets much harder
11. Lastly, perhaps ease a bit on the damage done by those flying water spirits? Those felt unfair rather than challenging.
Hope seeing of your game soon!