Sound: Music are enjoyable, but no VA.
Gameplay: The battle concept is very interesting, there's no wasted charas, because you must choose & fuse heroes carefully when progressing for every phase. The appeared heroes are based on rng (but you can also refresh it). If you want to be a good player, then you must memorize the fusion chart, classes, attributes and also items. Very tactical indeed. There's an auto battle, which is pretty useless.
Storyline: Story for the sake of RPG story, gather companions, stop evil & save the world. Basically, it's nowhere exist.
Value: There's gacha, hero/chara gacha to unlock the heroes so that you can fuse/evolve to them (or direct usage in quest), also dupes is useful for raising the specific hero's level & stats. Then, arcana gacha to get card (major & minor) for additional buffs. Relic gacha to get equipment for extra stats. Get wipeout tickets as many as you can. Daily shop is a great help.
The gameplay concept is great, but also tiring & take much time.