Pretty neat, but too short. The length is appropriate for the amount of story in it (though the fates of a few characters remains, for the moment, unfortunately ambiguous), but it doesn't feel like I'm suitably equipped for the hard mode after completing the normal playthrough. Then again, that was sort of the case with the base game, so it's probably fine. Yuffie and Sonon play pretty well, and the synergy system is neat, giving you an additional reason to budget your ATB meter for both characters. Elemental Ninjutsu is pretty neat - giving you essentially a palette of elemental damage to select from, regardless of what materia you entered the fight equipped with - but it feels like it might be too widely useful to remain as it is, so it'll probably be nerfed somehow in Rebirth. For this game, it serves as a good way to give your party a variety of moves to work with despite only having one properly controllable character.
The remarkably short length could be a huge detriment - worthwhile for people who are already onboard the FF7 Remake train, less so for people who felt lukewarm about the base game on PS4.