I really like the hit-box of the slash and how the game slows down as you perform it, but it certainly isn't without issues.
Dead bodies make it quite confusing as they are not easily distinguishable from the living enemies and don't disappear.
Also there is just too many enemies to keep the game from being stressful. Maybe if you replaced some of them with a different kind (that could only slowly go towards you, but would shoot a bullet?) and reduced the overall number.