Very smart interpretation on the theme. I did struggle with some of the controls, but when I got into the swing of things, it became very rewarding. I especially enjoyed killing the gun enemies :P
I didn't quite understand if the green enemies actually could kill you, because I cut them down immediately.
There's a weird inconsistency between how fast you strike an enemy and their very slow death animation, maybe them disappearing immediately in a puff of blood/smoke would be more fitting.