This is really cool! Being chased by a murderous flying sword and using to kill enemies is a great concept. I think it could be a bit better, might be more tense if the sword is faster and persistent the whole time after activating it rather than needing another prompt after 3 stabs. Maybe an enemy that can disable the sword if not maneuvered correctly.
The secret room was pretty great ;)
I'm guessing it was supposed to kill me tho :P