Really original concept! I liked the game's mechanic of life drain and having to kill being connected with your headless-ness. I liked the stylized artstyle, although sometimes blended, was still unique (the opening baddie has a barrel for a chest, and I love it). The sound effect and music were good and popping (literally popping for the lemon bullets, just a smidge too loud for me). The music was a great motivator to try and move fast through the level, although I think the camera could have focused on the player more and less on airspace above, but it wasn't too horrible.
Good job!