In essence, this is the game Streets of Rage Remake 5.1 in its pure form, without added mods. However, many of the additional characters produced have been added to this version of the game, which you can use as a selectable character. Some of them are ready and installed and you can use them right away. Others need to be added. You should know that they will replace some of the current characters. Therefore, you can back up your data folder as well as the chars and beckup_chars folders.