I don’t know if I like the minimalistic style to be honest, so I’m not sure I’m the person to help out, even if I can figure out the code. Realistically if we wanted to be as minimal as possible we’d get rid of seki puzzles altogether from the tutorial.
Explanations along with puzzles/testing out ideas, similar to your site or the interactive way to go, is more up my alley.
Or here’s an idea in puzzle set form.
I’d probably still like to cut down the wording a bit, but people can always skim it and just play with the diagrams. @xitoshi feel free to have a look through those ‘puzzles’ and see if they help you. The first few are just explanations really. I might add life and death puzzles and other things about killable eye-shapes.