Thrash metal. Actual, face-melting thrash metal in a side-scrolling shooter. Jets'n'Guns is a 2004 PC shmup and the entire soundtrack is performed by Machinae Supremacy, which means distorted guitars over chiptune synths over blast beats.
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"MegaScorcher" is exactly what it sounds like. "Archangels of Sidaroth" goes full power metal epic. And you can't ignore a track called "Erecta My Hamburger Baby" because what even is this game. The song titles alone tell you everything.
"Teh evul p4in of Doomy Hell." "Zogrim Ate My Hamster." This is mid-2000s PC gaming culture distilled into a soundtrack. It's aggressive, absurd, and completely committed to being both at once. If you've ever wanted a shmup soundtrack that sounds like a LAN party, this is the one.