So, I haven't finished this game, but honestly, this game does complex simplicity so well, it's up there with Mario + Rabbids.
Before we get to that, let's hit on what this game does poorly. This game is technically, a bit of a clunker. On PC it has no Borderless Windowed mode, the audio levels are way too loud and the game doesn't seem to remember my audio settings, and there's just a number of little flaws like that. I didn't play it at launch, so I don't know if it had a buggy or bad release or something, but as it is now, it's perfectly playable.
The game also doesn't do a great job of telling you what keywords mean and whatnot. I very much recommend this Steam guide to help you better understand the bits and baubles.
That all aside, this game boasts a menuless combat system, and it delivers pretty damn well. All actions are contextual: If you click an enemy, you attack. If you click an ally, you assist (think heals and buffs). If you click yourself, you wait (and use your wait skill). If you click an interactable, you interact with it.
I assumed, at first, that this would lead to very samey characters and abilities, but while there is a little bit of that, the is a surprising amount of complexity there nonetheless. Between different stat setups, the ability to choose your 2 accompanying party members (you always take Peony), and up to 3 summons, as well as 3 spells, and terrain effects, there's a lot of stuff to do with just these few simple controls.
You also have full freedom to customize your characters builds before each and every fight, and since things are simple enough, it doesn't feel like a slog or overwhelming to do so. Give the map a once over, see what you're working with, and you can setup the right elemental attacks, equipment, and even your little level by level stat boosts (I've had a couple of fights where I was forced to use only one or two members, and having just the right stat bonuses made all the difference).
The game has a lot of faults, but honestly, it is definitely worth looking into for those who are fans of tactical turn-based JRPG style games. If you miss the Tactics Ogre series, I'd say you should give this one a look.