fractals can be generated randomly by the computer , it was better if the levels of the game were generated randomly by the computer to make the game become endless ,
I would like to see the option anyway. You can put a notice before it that says something like, "Untested fractals might be buggy. Gameplay consistency not guaranteed."
There is a game called Superflight that does something like this. It has what it calls "seeds" which are basically input variables to create the procedurally generated world. Then people can share their favorite "seeds" and the game creates the same world to play around in.
With this method, even though many fractals won't work, people will find and share the ones that do.
By the way, this project/game is fantastic and I would like to support Marble Marcher in any way you need.
I'm not actively developing Marble Marcher right now, but the community edition is, that would be a better place to request new features: https://michaelmoroz.itch.io/mmce