To preface: I have played this through 3 times, 1st was good, 2nd was good special end, 3rd was turbo evil.
The other reviews do a great job of showcasing what is good, the characters are marvellous and the story is solid and coherent albeit kinda bland. With that in mind I feel there hasn't been enough criticism so I'm here to provide.
Size and Scope:
This game is fucking enormous. Generally more content is good, this is a JRPG so remember that everything is locked behind a grind or full of random encounters. You will at some point realise that perhaps they should've cut the floor count in half. Especially if you intend to do multiple playthroughs or want to unlock all the weapons (its not remotely worth it).
Gameplay:
While some aspects of combat are genuinely interesting such as "field" modifiers, equipment/skill mastery, and skill management, this is still a JRPG and every fight is still just a stat check or, more commonly, spam CC and debuffs. The "pronant" skill as an overworld ability sounds really cool on paper but devolves very quickly into "spam 1 on every npc for treasure". I still do not know how but somehow boss fights are worse than random encounters. As much as I bitch, I can't criticise this too harshly as its a massive step up from RPGM combat but goddamn I wanted to slam my head into my desk after every time I forgot to equip some ring that changes my damage taken per turn from 90 to 2. Also lmao Serafina can't heal outside combat so you might as well never use her since Niva is a busted buff/debuff slave and melees are like 10x stronger than the mages.
Pornography:
I'm gonna be real, if I get a game from DLSite or F95 I am doing so to violently crank my hog to anime women. I feel like the 18+ content only exists in this game because it would be too unbelievable for you to have mind control powers, 4 hot (not)sisters as companions, and not spend the entire time outside of dungeon crawling dumping your hot seed in every orifice.
There is a severe lack of wankable scenes even if they are generally very pretty. Most scenes go as such: rape snakes, rape tentacle, rape bandit, Demon Elon Musk rapes some annoying object, and lots of MC raping. It's err... a little heavy on a lack of consent and not in a good way. Rape is handled a little more realistically and SURPRISE women don't generally appreciate rape. They don't "wow my hips won't stop moving, kimochii~" and kinda genuinely despise you for committing an act of sexual violence. Call me a vanillafag but my penis enjoys consent.
Moral of the story, Japan refuses to let good men get pussy, only ontologically evil mfs get some gash.
4/5 JRPG, 2/5 HRPG soul enjoyed, benis did not