This is a game engine using C++ and many libraries.
Please notice even though this engine is public, it is not meant to be open source as it is being developed for learning purposes, you can try downloading and creating your own project, although it will be tough since many required things are being ignored. There's mostly assets and source within this repo.
Only available on Windows, download from the releases section and that should be it
SDL2 2.0.1 GLEW Dear Imgui DEV IL