The boss themes go unreasonably hard for a licensed anime game. Overlord: Escape From Nazarick scores Clementine's side-scrolling breakout with stage themes that shift from icy synth pads in the glacier levels to dense, oppressive tones in the tomb stages.
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Each Floor Guardian gets their own boss track and they're all distinct. Cocytus's fight has this cold, mechanical aggression while Shalltear's leans dramatic and frantic. The general combat theme carries solid tension without wearing out across repeated runs.
"王座ステージ" for the throne room stage has that final approach weight to it. Even the event scene music lands the tone right. If you wanted a reason to care about an Overlord metroidvania, the soundtrack actually delivers.