Visuals: Very cute art style and the world is very cohesive. You can tell that you put a lot of love and soul into it. The look and feel are close to Tunic and Link's Awakening. With a bit more polish, the visual side is already very high quality.
Sounddesign: The music and sounds fit very good. Feels good.
Gameplay: What bothered me was that after I hit, I'm stuck in the animation for another half second before I can move again. For a game that relies on an action combat system, the combat needs to feel dynamic and fluid. At the demo stage, this isn't the case for me yet. You should focus on improving this. The mouse looks cool, but with the huge backpack, I feel like a walking rectangle, and the hit animations seem very awkward. It looks more like flailing around. Additionally, I missed something like a heavy attack to add some variation to the combat. But I'm sure it's planned to unlock more combat abilities.
I hope the feedback helps you and doesn't discourage you. Your game has a lot of potential and you can feel that you have a vision!
Best regards