One Must Fall is one of the classic games everyone who ran DOS will remember. It has some fun gameplay mechanics like arenas that can hurt 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.
To be honest, I only added this game here because of it's great title track; the rest of the in-game music like the level tracks are not for me. They consist of some decent techno backdrops, but none stand out enough for me to give them a listen outside of the game.
Still, I'd recommend to check it out nonetheless, and see if you like it.