Visually impressive, the music and the bleeding mechanic to push the player forward really works well forcing you to complete the entire level in one go, knowing the pattern of the enemies to maximize the movement and the range of the dash mechanic.
The columns get in the way and make more difficult to track enemies and player, maybe lowered them? Or a shader to show them in overlay could also work unless those are just another difficulty to overcome.
I have only one question: I've killed the boss and I've not seen a victory sign, then I completed the entire level killing everyone assuming than that was the challenge, still nothing, there is a method to know if the level is clear?
Unless the ultimate meaning is that this is the samurai personal inferno, impossible to beat XD