The original Satori no Dungeon Oukoku soundtrack structures its entire score around seasons and it works so well. Each labyrinth maps to a mood: Summer of Pleasure is bright and exploratory, Autumn of Sorrow pulls things darker, Winter of Fury is exactly as intense as it sounds, and Spring of Joy opens everything back up.
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The battle themes escalate alongside them, peaking with Phantom Funeral Dance and that absolutely relentless final boss track, The Strongest Enemy Awaits in the Abyss. Trapped in a Game World as an opener sets the tone perfectly.
And that closer, Our Adventure Is Over... yeah. If you played the sequel first, going back to this one shows you where all that energy started.