It's been a b*tch but Great Glacier balancing is now done. A ton of bugs fixed, too.
Progress was made from:
Forgotten City CD2 -> Ice Fields -> Snow Village -> Great Glacier -> Snow Queen -> Ascend of the Glacier -> Icicle Minibosses -> Shizo
I'll work on the Whirlwind Maze next
I've put implementing any stuff beside the difficulty overhaul on hold for now (That means Hidden Objects, Trivia, New Story, New Threat Features I've been given permission to take.)