Great art, for both the characters and the environment. Boss fight was really well polished too. The enemy variety is impressive considering how much work was clearly also put into the boss.
I didn't really feel the effect of the sword only dealing damage on the edge. It felt like whenever I hit something with the sword in general, it would take damage. A longer sword might make that aspect of the game more clear.
The boss's attack where it sends things flying at you from the side feels really unavoidable. The top-down version is much more manageable because you can quickly move left or right.
Overall, really good job! Especially for a 1-person game.