It's a good-looking informal font, with a very flexible model, and an interesting way to animate it. Wonderful! I'm happy to see what have they achieved technically and aesthetically.
Any claims of pedagogical helpfulness should be made very cautiously though, before there are multiple independent studies of that.
yes! and the animation and flexibility is the point that's missed by most fellow commenters.
they enable a font to be parameterized in two dimensions: time and prosody, i.e. speech pattern.
so subtitles and learning materials can be animated to reflect the speech pattern (stressing words, rasing and falling pitch, volume overall, ...) and they can --- independently --- be animated to teach writing, by reading the example.
this is a curious novelty that allows experimenting with the representation of speech and I'm looking forward what will come out of it.