As of their patch on October 20th, the developer Wako Factory release a Linux version. This patch also included cloud saves as well as bug fixes.
About the game:
Samurai Riot is a 2D cooperative Beat’em up / Arcade game with a twist! Playing as Sukane or Tsurumaru, two charismatic warriors torn between their duty and beliefs, follow your own way of honor through multiple scenarios and story endings!
Samurai Riot was born out of the will to bring back the greatness of Beat’em up arcade games style (such as Street of Rage, Double Dragon, etc.) and add cooperative features based on multi-scenario possibilities and multi-endings! Each player can fully control the destiny of his/her character, either playing coop or solo.
Unlike a lot of beat 'em ups it's not just a straight brawler, instead you will be faced with making some choices. All of which can change the ending you get, allowing for multiple playthroughs. You could choose at one point to burn a village, or stay clean. There's eight endings in total, so it has a few different paths to follow.
Since it can be played in co-op, you don't have to make choices as a team. It seems if you pick differently, you end up in a PvP fight.
Sounds pretty good, looks great too!
Thanks for the tip Bidinou!