I will be direct and without half terms: this game is bad developed and terribly optimized.
It will give you problems unless you want to loose your eyes lowering a lot the graphic settings, if you're not on top devices. Aiming is bad and moving the camera is terrible. Graphic is "acceptable" but really soulless. The pre-registration skin for the main character is worst than her default skin (lol). It's hard to understand the element of units you're going to use. Except for some cut scenes, there is no voice on the story (at least in English). This game is made more for pc usage, not mobile. At the moment I'm playing on my desktop pc, where at least it works smoothly. Honestly, there is a lot of work to do from devs here.