I browsed the website but I could not find a simple url I can put into my radio player. It appears the only way to listen is either on the website or twitch[.].tv which seems to defeat the point of a radio stream.
I was able to extract the audio URL track via yt-dlp. Ifyou also add ffmpeg, a FIFO and soco-cli in the mix I was able to play it back on my Sonos speaker, although I had to jump a lot of hoops to curb the HLS stream into a standard shoutcast/icecast URL stream.
All of that to end into a bland chiptunes radio, not worth all that effort