I will try some balancing over the initial blood as you suggest but maybe I'll expand on it by changing the arena formula into a level structure without infinite spawning enemies.
I went for a strange approach for spawning harder enemies by tying it to the blood counter I should have gone for a timer instead as probably it's hard to see all the enemies(5 enemy types as of the end of the jam) if one keep pouring blood to the sword.
I will probably because for how unfinished it is I liked how the combat and the look came in the end!
Thanks for your in depth thoughts on the game! :)