This is a fun interpretation of the theme. It's interesting that the shape of the head of the enemy acts just like the walls. Making the bow rotate with the direction is also another cool detail.
I find it difficult to predict where the arrow is going to be after the initial reflection. It will also be cool to be able to pick up the arrows midflight, but it might cause problem where the player only wants the arrow to reflect back.
Great job on the game!