One Must Fall is one of the classic games everyone who ran DOS will remember. It has some fun gameplay mechanics like arenas with environment effects that can damage you, screenshots of your best (or worst) moments integrated in an aftermath review, and upgrade/customizations.

There's a great version of the soundtrack on Youtube, you can find it here.

Also, the interview with it's composer (Kenny Chou) is worth reading: game-ost.com (archive.org).

The rest of the in-game music consists of some decent techno background tracks with some nice melodies.