Rën is a script (ritë) developed by Justin Mann for a philosophical language of the same name (Lokë Rën). It is designed to be easily learned and written while giving it a beautiful and complex appearance.
I always try to applaud cursive style scripts, if for nothing else than the undertaking itself. However, like many before it Rën suffers from fatigue. While the design of the individual characters is simple and seemingly elegant, the resulting text looks more like apoplectic PhD student hurriedly trying to finish the last lines of her dissertation. There’s also the issue of voiced/unvoiced consonants being distinguished by only a diacritic…not something that I favor, most especially in cursive alphabets.
On to the sounds (orthographic representation). I’m not sure there is a natlang precedent for having [θ~ð] contrast with [ʒ] but not have [z]. And as a note on presentation, the page gives IPA for the diphthongs but not the base vowels. I suppose we could assume /a, e, i, o, u/ but that doesn’t seem accurate based on the diphthongs. Also, the use of the umlaut seems wholly unnecessary and likely ill-informed based on the rest of what phonemic information is available.
Over all, this script gets a 3×1 for aesthetics and functionality.