I managed to fix my controller issue by completely purging XBoxdrv from my system and reverting back to the default XPad drivers. Doing so also fixed the minor button configuration issues with my XBox 360 controller.
Challenge Battles have been implemented! Find a Challenge Gate, enter it and fight a battle with special conditions to earn special prizes that will be useful for your journey! Losing a challenge does not result in a game over, and can be instantly retried if failed.
There are locked doors and the key system that was in the game as a mission objective has now been changed to act like normal keys! Keys only exist within a mission, and don't take any inventory space.
Lastly, new animation for obtaining a Persephone power.