I like the idea and it has a story supporting it so it feels immersive. Art and music are also great, it would be good if you've had made drawings for buttons as well, but I'm assuming you ran out of time.
Problems: I took me a minute to figure out that I can only move the shield away from an incoming arrow (this is me with only info from the game itself) - you should show button prompt to dodge an arrow when you can, you can just spam every arrow key and be invincible - you should maybe make it that there are less arrows incoming but you gotta time it right so if you move away to early the shield moves back in front of the arrow.