Hello Aekashic! I am a member of you on patreon and I develped a free game named 'Monster Rebirth' which use the animated battlers from you.
It's a game with roguelike dungeon and monster fusion system and unlimited battlers system.
you can use monster fusion whice make two monsters into a different one with their skills.
You can fight the battle with all of your monster.
Once you defeat a monster it will join your party but once a monster you own is defeated it is gone for good.
But the computer which is under english operation system maybe can't load this game because some bgms 's name are Japanese. So I uploaded a fixed version and I hope you like it. Thanks again.
The original one:
https://valhalla9386.itch.io/monster-rebirth
The english fixed one:
https://valhalla9386.itch.io/monster-rebirth-english-version