Some info:

- Client is written in Ć programming language and can be transcompiled to many languages. Yet it's still a C# project that runs in Visual Studio. See https://github.com/marioclone/Mario and http://smb.neocities.org/game.html for example how it works.

- Game is currently being made into a commercial product by a big company. It looks beautiful. There is a whole team working on it, including many artists.