Cowboys Unison.

Cowboys Unison is a Run and Gun/Beat´em up video game, in terms of a fan game, this is an non-officcial and direct sequel  of Sunset Riders and Gun.Smoke. The story? a Cowboy named Darius Schneider and Elise Whitefield join forces to fight the most dangerous outlaws of the old west armed with 2 legendary revolvers called The Unison Guns.  The game is a homage and parody of the western genre, adding cameos and references of some popular cowboy characters.  Cowboys Unison shows a gameplay that slightly mixes elements seen in games like Gunstar Heroes, Contra, Megaman and even Bucky O Hare. (Arcade Version)  With various unlockable modes if you beat the game.

This is a total Free game available for Windows and Android.