If you open the editor on a bigger window (I think I made it 1000px or more) you'll get the "full" editor with the dots that you are missing. I may make it an option so you can get the full editor on mobile too.

And yes, more points and different aspect ratio would be nice, currently the `textarea` works by having a native textarea invisible on top of the SVG render, and tuning it to be in sync was a bit hard. So I think I can make custom grids and ratios happen but I'll have to disable the textarea for them, no big deal I guess :)