The Black Heart originally was created from Mugen. Easily among the greatest indie fighting games I ever played!!! This is virtually Mortal Kombat meets Silent Hill. Which is very wild to imagine. You get a decent size roster that all plays differently. The art style is very interesting that matches it's overall style well. You get finishers that do kill your opponents. Some rather impressive animations you won't expect among first playing it. You also get fantastic music with beautifully spine chilling sound effects. This game truly delivers in a way your mind just can't accept properly. It's a game created from another game that's somehow stands on it's own. The Steam version added stuff to make it a complete, definitive version. I do think considering a lot of fighting game fans are on GOG. They absolutely would love this. The Black Heart is among the best horror theme fighting games I ever played!!!