(I've got permission to post this, ask Moegreche.)
Here is the mod page with the link and the details (Sonny Wiki).
Features:
-Rebalanced abilities, leveling, classes, items, teammates, enemies, and re-spec.
-New classes, abilities, enemies, stages, items, drops, training fights, strategies, menus, sfx, and story.
-More accurate descriptions/info.
-Fixes, bonuses, extras, references, easter eggs/secrets.
Version 2.1 (2022 December):
-2 new armor sets
-new sfx
-Dodge (Assassin class default ability) replaced with Parry due to balancing issues