Looks fun, but a bit overwhelming (though don't mind me on this part, I'm not a very good player, and this is the 1st vampire-like I played)
Tried a few runs on the 6th char and one run per other characters, only for 5th run understood what I need to do to move forward.
Also, about key mapping. It weren't pleasant to remap as it always says like "this keybind is already used", I suggest to either swap it on the fly, or letting two binds for one action, so it won't feel such clunky there. But I see it is an early stage, so you will get to those later anyway, I guess.
Good work! Wishlisted to help with steam algorithms.