I just got this two weeks ago and finished the main story a few days ago.
It's basically a giga low budget fanservice mashup of SO3 and SO4 that failed to deliver, imo.
It wasn't a terrible game, but it was still the worst Star Ocean, and one of the worse jrpgs I've ever played (and I've played a lot).
The world is a tiny, it's only one world, there's an extreme amount of backtracking, how to activate PAs was bad and uninspired, talking to npcs was annoying, the camera bob made me sick at the start, and the 'seamlessness' aka the lack of cutscenes, with everybody just standing/walking and talking, made the story lack impact most of the game.
But to be fair, the battle system was slightly fun, the music was all right, the characters themselves were unexpectedly enjoyable, and the content of PAs was better than the main story.
Everything about the game screamed a lack of budget to me. It's the Star Ocean formula, but done cheap. They tried a few new things (for the entire genre, even), but ended up mostly failing.