Someone squeezed a dark sci-fi shooter soundtrack into a GBA sound chip and it actually works. Xyanide's unreleased portable port has this gritty, compressed energy that makes the whole thing feel more intense than it has any right to be.
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"Hull Breach" opens with urgent chiptune drive that sets the tone immediately. By the time you hit "Nautilus Depths" things get more submerged and atmospheric, which is wild for GBA hardware. The two boss tracks go hard, "Tense Moments" especially just pushes the tension relentlessly.
"Evolving Passage" does this cool thing where the melody keeps shifting underneath you. Never officially released, which is a shame. If you collect unreleased GBA music, this is the kind of weird artifact worth hunting down.