I'm going to be completely honest.
I think calling this a demo isn't accurate, since normally a demo lets you try at least the first level of the game or even tells you some of the story. This feels more like a checklist for a school assignment. "I see it has a tutorial, some enemies, an NPC with a quest, a boss, a basic inventory... thanks for your work, here's your grade." I don't know what to expect from the game because it doesn't show or tell me anything that differentiates it from a "school assignment." I don't think I can give much of an opinion about the story from the introduction alone, but the protagonist raises questions for me: why does she look like a vampire or demon girl or something, if the introduction talked about a queen who was about to be killed or something? Again, there isn't much to go on regarding the story, but it felt weird to me. Maybe I'm wrong about this because of the lack of context.
Some issues I encountered with the game were the motion blur, which honestly is more annoying than aesthetically pleasing. Combat feels clunky, as rolling requires double-tapping the same button, which can be annoying if you just want to walk. The character's attack range isn't intuitive: I have to be practically glued to the enemy to hit them with a weapon that seems quite large and doesn't deal area damage. Combat doesn't feel fluid at all.
The minotaur boss presents a problem: being so large, having a small weapon, and the character being small, if you stand too close to it, it can't hit you, but you can hit it. You can also avoid its attack simply by gaining some height. Another bug I noticed was that when walking, I often couldn't jump at the same time—sometimes I could, sometimes I couldn't. Also, for some reason, if I equip a weapon and then unequip it, the damage stat stays the same, although it does change when switching weapons.
So much for the bugs or issues I encountered. Overall, I don't think this can be considered a demo or a good beta. I still feel like it was a school assignment based on a checklist. And I don't see it from a teacher's perspective... but from someone looking for something fun or eye-catching, but I didn't find anything that really caught my attention.
Last but not least, it's an opinion without any intention to offend... It was just what I felt when I tried it, you see what you want to do with what I said.
P.S. This was the only game in my life that ever gave me a blue screen. And it was only because I rolled the credits.