I haven't seen this kind of a mechanic before. Swing attack is a good concept and love that the player lack the vision. But while playing it I felt that it could be a bit more dynamic, because for me it felt a bit too slow. Otherwise, great job!
Did the player movement speed or the rotation speed of the sword feel too slow?
I was trying to balance making the weapon feel very heavy and hard to move but also not making it too slow that it took away from the player experience. It could probably still use some tweaking.
I felt that it should not that heavy, or maybe that when you swing there is some kind of particle or something that gives the swing feeling. Or a sound effect?