The name of the fork is: Tenacity https://tenacityaudio.org/
The developers of the fork have a detailed history explaining why the fork happened: https://tenacityaudio.org/docs/_content/Introduction_and_Motivation.html
Their mastodon account https://floss.social/@tenacity
I played for a while on the switch, controlling with buttons and stick is so much better then with a finger on a phone or tablet, but they kind of stopped supporting the switch version with new updates only available to mobile OS. It is a fun little game to kill a few minutes.
I tried Elder Scrolls: Castles when it came out but it didn't click with me.