Last year I went down a long rabbit hole of trying to get the original After Dark screen saver to run on macOS. I got pretty close; following a guide and using a Wine wrapper I was able to create a stand alone application that when launched runs After Dark full screen. Wiggling the mouse would exit full screen and close the app. The only part I am missing is getting macOS to launch an app instead of a traditional screen saver.
A link to the original guide and the modified steps I used: https://gist.github.com/atommclain/863e5cd47ab714c1e4e966606...