Been working on a fighting game project in the Godot game engine. Finally got together the basic template/structure for one. These two crash-dummy-like place-holder characters can kick, punch, jump, duck, throw, and perform unique special moves with the classic motion inputs. Plus they each have a life-bar that depletes as they take damage and a winner is declared when someone runs out of HP and is KO'd.
Now it's just a matter of creating characters and fleshing out the mechanics. I've got a sketchbook full of ideas!