Comment by lohengramm

You can use any language, but it's not like they are all equal and have the same tooling available. Rust has some distinct features and there is a natural lack of resources as the language is still new, so it's interesting from a developers perspective that someone went through the work of doing all that from scratch and made it to the end.

Also it's an alternative to C++ which is heavily used in gamedev. I personally believe Rust can shine in gamedev and every experiment is interesting.