Awesome demo! Reminds me a lot of Sekiro's combat system with the balance between stun damage and actual damage. The first boss has been a great deal of fun so far, and I definitely wouldn't say the game is too challenging.
If I were to make a critique, it would mostly be the lack of diversity in the enemy move pools. There's a fine number of enemies, but they each only have one attack pattern (or, for the archers, two), and I think it would be more fun if most of them had two and 'skilled' opponents had three. The bosses are fine, though, with the two attack patterns for the miniboss and however many the actual boss has (four I think? Maybe just three though).