The dev version is hosted on the github linked above! Dev stands for "in development", as it is for testing possible features for the future and fixing bugs (as such, it is very buggy at times)
The development team recommends just sticking to this public itch.io version since it is much more stable than the dev version.
As of this recent update from a few days ago, we can now update the game automatically rather than redownloading the file every time (which we used to do)