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the battle system is pretty good
it's really weirdly formatted for mobage though
story mode has no limitations on how much you can play, just your patience, and the rewards besides story progress suck because of it
there's a 10x limit per day thing to increase you skills which also gives good exp/gold, and that's basically the obligatory "daily quests"
then there's the stamina, because of course there's stamina, but that's mostly for getting materials to lever up summons, and also a medium exp/gold rate, along with maybe equipment or skill upgrades if you want to chase those instead of summons
stamina world usually has 1 or 2 places to choose from and is open two weeks at a time before it changes to focus on a new summon or specific character equipments
daily quests just change color
story mode releases a new chapter monthly (this month's chapter was all about sucking lightning's dick while squall says whatever)
the gacha is for weapons, and weapons are mostly not there as stat sticks, but to grant the character they belong to an overpowered (or not) skill
some characters are total dogshit without their weapon, like yuna's esuna only works on whole party if you have the specific weapon
the characters you just get through story mode, or they're available for 2 weeks at a time alongside some strong fights that they want you to do co-op to beat (co-op matchmaking is a nightmare)