I really like your take on the theme: persistent corpses. It turns the vampire-survivors/twin-stick shooter kiting and dodging power fantasy into a much more grim affair, matching your music and art.
I was a little bothered that the pixel art is stretched to a variety of resolutions in-game. A lot of the animations and textures looked fantastic, but seeing them side-by-side at different zoom levels distracts from the overall aesthetic.
The attack felt a tiny bit underpowered - with an animation that doesn't correspond to the actual attack area, it's really tough to deal damage without also getting hit. Death feels inevitable if you stand and fight - which may have been what you were going for!