Version 1 of BFDI: BRAWL. Deprecated, accesible for historical purposes. Since the April 2018 Update, but commits date back until January 2018.
No builds are available here, but you are able to clone this project and build it yourself through Unity, and configure 4 characters and 3 different battle stages available in the project. The project uses Unity3D version 2018.1.1f1. You are able to find and install legacy versions of Unity3D through Unity Hub.