The Bunny Kill series was one of my 1st interests in Newgrounds, I can honestly say that this submission made my day. I wasn't expecting it at all. Seamless animation, detailed artwork, and superb character design. The smoke popping sound effect was a little overused but otherwise suitable.
I'm positive you have played Ninja Gaiden, I noticed some resemblance of the game play during the fight scenes (Which could have been coincidence.) but the final scene with Ruby's grave was exactly like the end cut scene from Ninja Gaiden.
Excellent soundtrack too, I look forward to your future submissions!