One main theme and it goes harder than any single-track OST has a right to. Mutant Zone was developed by Opera Soft and released in 1988 for PC-88, a Spanish studio working with Japanese hardware. The main theme has that late-80s FM synthesis crunch, melodic lines punching through the limited sound channels with real compositional ambition.
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You can hear the PC-88's YM2203 chip being pushed, tight arpeggios and driving bass competing for space in a tiny number of voices. It sounds like European computer game music filtered through Japanese sound hardware. That specific late-80s cross-pollination where Spanish developers met FM synthesis.
Just one track, but it carries the whole era in its waveforms. If you collect obscure 8-bit computer soundtracks and you haven't heard this one, it belongs in your rotation.