Yeah, trying to get the concept clear was the biggest struggle for me. I wrote the game and still found myself getting in a flow and trying to stab enemies to death. Making that concept clear initially without spoiling the story is tough to put into a few minutes-long game.
Vamp Dagger was probably my favorite. Overflow kills are so satisfying and you get to zip around the map after using it. FOUNTAIN is also an amusing strategy.
Thanks for playing! :D