Very nice demo, I can see a lot of work went into making all of the models and animations, "maybe" some of the animations were playing too fast and felt awkward but I got used to it with time. The hub area works even though looks a little lackluster, I'm an explorer so I had to visit all houses and surroundings and some rocks looked very low poly and had low textures (behind the witch's house for example). HUD looks great, looks professional, I especially like these red buttons when leaving the area.
I jumped on barrels and got stuck somewhere close to the forge. Camera has no collision with floor when standing in the cathedral after beating the witch. Camera could use some easing as it jumps rapidly when we have obstacle close to it. Also I think that lock-on is a little off. I think it should be always dead center, and here it's always a little to the left or right.
I've beaten everybody EXCEPT that last foxy lady. She's a monster. I tried at least 30 times, and I already got good! Could parry her jumping kick, could parry her grab, I had plenty occasions to parry her rotating fan combo. Got multiple times to the second phase but there was always something killing me in the end. I think it's too easy to lose your health bar or maybe she has too much health. Any time I was trying to attack her I was doing literally chip damage. Either that sword is made from paper or she has steel skin.
Dialogs could use portraits, it's easy to get lost who talks when. I don't follow the story, my gut tells me it's just an excuse to put waifus into deadly scenarios. There's a boob lady, boob lady with a big sword and there's that witch...
I also see there's onsen so I'm guessing we'll have a mandatory bath episode. I dunno, I'm not sold on the characters and the plot.
The game is in a good state. I'm afraid that you'll have to grind more enemies and that will take a lot of time. I'd personally prefer some normal mobs to kill between bosses - they can be reused, they don't have to have too many unique attacks, you could practice your magic on them. I think it's a sensible thing.
BTW I saw that your demo was promoted by some high profile account on twitter. You're gaining popularity so keep it up!