Hello first of all you have a nice concept for an rpg maker game haven't seen one like this before with the engine.
I also wanted to mention a couple of bugs I encountered.
1. Wanted to mention the save problem but I see you found out about it allready.
2. Once you are defeated and the run is starting over, the map starts of black with only the possible paths highlighted. I think you forgot to put a fade-in back once you are brought back. Fixes itself once you get to the second area though. But the scenes you could encounter in area 1 can't thus be seen upon being defeated.
3. I believe your new random encounter is supposed to give you a weakness but it doesn't show up or seem to be applied to your character.
QoL
I am aware how many RPG maker games work as in button layout but I don't think there was a place that explained to the player that you can acces the menu with X.
I am also unaware what the stat willpower does that can be increased during a random encounter.
Perhaps creating a button on the map screen that brings you inside of your army tent within which you can save and edit your decks and view an encyclopedia within which some stuff can be explained.
Good luck