Hi there.
I recently made a quick patch just to minimize the problem with "Death" spell on the final boss. This is something I hope to solve in a better way in a next patch, but I wanted to minimize the problem now.
Patch
-Lowered "Death" status effect probability.
-Increased "Death" effect to 20 turns.
I started working some time ago in a new update which is more like an Expansion to the game. It will still take some time but I decided to talk about it so you know it's coming.
It's a whole new dungeon, with different sprite floors and enemies. I also have a couple new ideas I want to introduce but more on that later.
Meanwhile here's a screenshot of a new floor.