Very rough. Not sure if the full screen stretch caused the blurriness but the game was super blurry. Definitely need to include explanation on controls.
From what I could tell after putting out your sword by clicking you had to move your mouse around to actually attack.(Don't know if this was intentional or a bug). There also seemed to be a lot of other minor bugs with movement and things pop'ing in/out of the environment.
The explosion of enemies/objects in the game was neat though and I liked the little semi-destroyed objects left behind.