sorry, i wrote a comment forever ago but i guess it didn't post??
anyways to reiterate what i tried to say earlier:
concept is nice and creative; there's a lot you can do with the rotating mirror shield gimmick. it would have been interesting to be able to use it to deflect projectiles from different angles to fully utilize the rotating mechanic, but i understand that you only had 3 days to get this done. the art was detailed and well rendered, especially the character assets. the main menu and the music were also nice touches and made it feel like a more complete game, as well as the explanation of the story and controls. i also liked that the game had endings, as it made it feel more complete (though it made the game short, but again, 3 hours). 

my main criticisms are these: 

- the large armored enemies are a little janky, as the main character's sword animation is not indicative of its hitbox/range, which may make them stand too close to the enemy and take damage (something i did a few times before realizing the hitbox was bigger). 

- the game feels very short, even in regards to the amount of time you had to work on it. while i understand the time might have been used to polish assets like music + visuals, the game is less than 2 minutes long when played in full. could have been extended easily with more dialogue, enemies (even if reusing the same ones), projectiles, or enemies going down in more than one hit.

- there are some (minor) bugs such as the mirrors health bar not being in the container made for it, or the character getting stuck while moving to the right (though this can be fixed by jumping)

overall good concept, good presentation, and there's a lot to work with in the future if you so wish