Very polished! Great art, great design! What I liked most was the dynamic fog of war in the dungeons! Really added to the shadowy vibe. The controls were clear, although I would've liked to be able to switch weapons with my number keys like in many shooters. I would also have liked that the game would pause when opening up a letter, because now I kept being pounded when trying to read your story. I played the swamp and the forest dungeons, after which my game sadly crashed. Maybe it could be because of the great amount of projectiles they fired off. Each time they would do an attack I'd be flung around the arena with 2 fps. Furthermore, maybe you could incorporate walls or fog in those fights to also be able to play with the fog of war in the bossfights!
All in all a very good designed game. I was interested in the story and the letters were a great addition to give incentive to clear the whole floor. Just a fun dungeon crawl!