I tried this today, hated it. At first I was super excited, felt like a new FFT, and in some ways it is. But it is so brutal and aspy-ish, tuned so you have to do the exact correct thing on all 15 turns or you fail and have to replay the entire map again, and sometimes trial and error what to do because there is no indication of what a good strategic approach is. It doesn't matter how much of a strategy grandmaster you think you are, if you take the obviously better path and then a bunch of extra enemies spawn right in front of you... That is a game designed to make you replay the level.
FFT was tough too and sometimes needed a restart, but mostly a good strategist could figure out what to do. This game needs grindy replays. The nail in the coffin for me is that in an already unfair game, they also have RNG which is such bullshit. For example one map has you fight several enemies with 3 characters, and you can't lose a single HP. I tried this 6 times and failed each time, I decided it was impossible and the game was bugged. I could achieve the maximum success on every turn (killing 1-2 enemies), but there is always another enemy that nips you for 1hp and you fail. Then on my "I'll give this one last go" 7th attempt... instead of a health potion dropping on the first enemy as it did 6 times in a row, an action point potion dropped which lets you basically have 2 turns. So then the win was easy... Total bullshit.
But winning with 0hp lost was an optional extra objective so I kept going. Then I had another bullshit battle, I rescue a guy, have to flee to the exit. The first time I looted an invisibility potion from the chest, but I clicked it by mistake. I still play well, my party fights close to the exit and I run the prisoner almost out the front door, then an army appears blocking the entrance. They 1 shot him. All I needed to do was use the invis potion at the last step. Fine... I'll replay this bitch. But on the replay, no invis potion, and I failed trying to escape. Again, I know I can win on attempt 3 or 4, especially if that potion drops again... but the problem is that you have to wonder if replaying these little anal battles is even fun? For me the answer is no. I just finished TOEE which was so much more fun. A better comparison is Blackguards which has similar grid based + turn based battles. That game seems a lot better, although I don't know how advanced this one gets in the higher levels. I don't know if I will just uninstall this or see how it goes.