A reoccurring struggle I've been having with the gameplay is that I find explore and gauntlet battles completely unengaging due to being auto battles. I find myself looking away from the battle entirely because I find it so dull to watch and it being completely out of my hands. It leaves me bored and almost unwilling to do the gauntlet tasks when they show up because I know that I don't enjoy it.
So my suggestion is this, a toggle to swap between an auto battle and manual battle to give a little more control to the player for battles, even something as selecting a target to be attacked would work in my mind because I'm actively contributing to the fight as opposed to sitting back and playing a different game on my phone while the gauntlet happens. Having manual battles might also allow the implementation of a more strategic fight in the story mode campaigns where you have to take down a certain enemy first to either stop the boss from healing or shielding, which might end up being frustrating to do in an auto battle where you don't have control over the attack target.
Being a toggle would also probably appease both people like me who'd like a little more engagement with the battle system and those who already enjoy the auto battle system for what it is.