Thank you so much for trying it out! Yes, it turns out my perception of the difficulty might be a little skewed since I played it from day one haha. I was nervous to decrease the number of enemies so that the level always felt full, but since they track you immediately it does tend to immediately create a swarm. In retrospect, having them patrol until you're within a certain radius and THEN move towards you would have helped a lot. I tried to do a few things here and there to make it easier: hits from the back do less damage, sometimes hits won't deal damage below a certain health threshold, and you can heal above your max hp as much as you can afford it, but I think addressing the enemies is the way to go.
In the future, I'll try to get more playtesters and learn how to implement a proper difficulty curve.
Thanks again for your feedback!