I give up, after half an hour I couldn't beat her, once I got her down to 20hp.
The game is definitely fun and satisfying, but I have a big issue with the player health, I feel like there is no feedback and when I die I often have no idea where the hit even came from.
On my best try, I ended up doing a very boring strategy where I remained far away, and shot from a distance once in a while, spending most of my time on shooting the slimes.
I guess that's a skill issue on my part, anyway great job!