To run it on Linux you download, unpack the first .zip and the .tar.gz file, then run ./Clangen in the main directory.
To run on Chromebooks you can go into your Developer settings, enable Linux, and then follow the above instructions though your mileage may vary if you can't understand where your ~/Downloads directory lives
Guide here; https://www.pcmag.com/how-to/install-linux-on-your-chromebook
You can also use the website, instead of complaining that it might be a version or two behind please give some money (€1-5) to the developers to help give them the resources to keep your fan game going.