So the savegame folder for the 2.1 version in the OP is actually inside the extracted path,
Escape Dungeon 2 Build.8430092\EscapeDungeon2_Data\Plugins\x86\steam_settings\1309000
Unfortunately the most current save from Kamimile here
https://f95zone.to/threads/escape-dungeon-2-final-hide-games.93879/post-8470386 lacks some of the final scenes and the Cyclops scenes altogether.
Only the user_memories_json seems to have an effect, and sadly i think it's encrypted base64 format.
Using cheat engine ingame to try and bump the monster killcounts doesnt work either. And i am not going to grind the many, many loops needed for that ...
Fragment count and most everything else can be modified by cheat engine just fine. So you can be unbeatable and immortal, but you still have to play though multiple times to achieve the kill counts...
I mean the game is surprisingly fun for an hour or two, but then its just grindy and repetitive.