It seems that the weapon's collisions interferes with your own blood projectiles, and by doing so it is more difficult to defeat them. The player must aim for their bodies precisely instead.
The dropped blood being poisonous to the player is a good game mechanic though. There are more risks to the player as the blood's number builds up on the floor, therefore, the player must be careful and strategize where and when to kill certain enemies.
Overall, this could do some polish and can be expanded more. Good job!