Really fun game I went for two playthroughs and almost managed to kill the final boss, The blood mechanic was pretty nice, i didnt really get it at first but once you start seeing the messages it all becomes more clear, on thing I would add a health tombstone in every stage at least 1 and maybe add a blur effect for the border of the sight circle to make the enemies appear more smoothly.
But yeah great work, and really cool boss fight keep it up