Tracker music running through a late-90s shooter engine and somehow coming out sounding like alien ambient you'd find on a lost CD-R. Unreal's score by Alexander Brandon and Michiel van den Bos basically invented a mood.
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SkyTwn floats with these airy pads that make you forget you're holding a gun, then Isotoxin drops in with gritty breakbeats and distorted synth stabs that pin you to your seat. Guardian has this tension that just builds and never fully releases.
The whole thing shifts between serene and threatening without warning. If you grew up in the era of .umx files and have never gone back to actually listen to these tracks outside the game, you're overdue.