Firstly, I think this is a cool idea. Fractals are fun to look at and play with. Please take this feedback as being positively-intentioned :)

During the tutorial I clicked Add and some boxes were created. I dragged them around on the canvas. I have no concept of how the resulting image [0] relates to what I created. It doesn't look like the kind of fractals (Mandelbrot etc) that I'm familiar with.

I also didn't figure out how to do anything other than move some boxes around. Probably I just missed something.

[0] https://fractal.parts/i-dont-get-it <-- if you click the "Attractor" (what does that mean?) toggle in the top right you can see the "Template" I created in the editor.