Once you have RetroArch installed, try out Gunstar Heroes, one of the best run and gun games ever, originally for the Sega Genesis. I really love the music in this game, some of the best of the 16 bit era. Non stop action, a weapon combining system, and brilliant graphics make this treasure a must play.

https://www.youtube.com/watch?v=YS77a4eeXTo

https://archive.org/download/GunstarHeroesUSA

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