Just played the latest update
Pretty solid all around, and that new boss was cool as well
That said, I feel like the sprite layer of the projectiles from the 3rd boss should be above that the of the boss. I ended up taking quite a lot of damage because I couldn't really see why I was taking damage.
I also think that the colour of the projectiles could be a little different from the environment. Mostly because they kinda blended into the environment sometimes
This also applied to the final boss quite a lot. Everything was red to the point that the boss, it's attacks, the player and the player's attacks all just kinda blended together at times.
I also think the game is maybe a little too forgiving now ? Maybe the player could take slightly more damage with every hit, just to ensure that they can't just tank themselves through the game. Admittedly I kinda did that in some places
Also, just a small suggestion, but maybe a successful stab for health could increase your combo meter depending on the amount of blood you absorbed
All things considered, the update is pretty great overall. Solid work on this.