Interesting concept.
I liked the graphics but I would tweak them a little bit. It has a unique look but it's hard on the eyes. Maybe tweaking with resolutions / "sharpness" would solve that.
The gameplay itself is good. The bow is easy to use and I had some metroidvania feeling from the exploration. :)
One bug I noticed is that when I kill an enemy, the collision remains there for a really short time after the 3D modell disapppears. I can kill the enemy then walk there when it already vanished but still got damaged.
Not sure how Unity works in this regard but you could try disabling the collision detection on the killed model right after the model itself is removed.