This seems like a similar release to Final Fantasy IV: The After Years and XV: Pocket Edition, which also started as Mobile only.
In those, the first episodes were free, then all later episodes were purchased as DLC.
Both of them also got Complete Edition console ports once all the episodes were out.
The After Years even had a fully explorable world map and side quests despite being episodic.
Battle system looks similar to XIII or X-2 to me, where the characters move around the battle arena and do fancy looking combos, but it's just for show.
Uses the look and animations from VIIR, but it's actually all command based.
I'm cautiously optimistic.
This could be amazing.