During the initial playthrough, this game can drag you in due to the following factors: style, diversity of characters and passion for gacha roulette to knock out characters (sometimes too much). The game by its nature is a rather interesting RPG, but due to the system of knocking out artifacts and characters, it can quickly get boring. Being at rank 58, I can say that there is almost nothing to do in the game, because everything gets boring (performing the same actions over and over again).
Based on the plot, I can say that it is very boring in places and gets boring quickly (hello Paimon), which is why 90% of the plot and other side quests are completed, you sit and try to skip dialogues by killing your mouse, keyboard, buttons on the gamepad or screen phone.
Optimization is pretty good on a computer, but sometimes there are times when it can take forever to load with good components. I don’t know well how things are on mobile devices, but I know that you need a fairly powerful smartphone of the level, maybe a snapdragon 778 (my personal opinion), on budget devices everything is much worse (especially after playing on a computer).
The gameplay is interesting only by killing some mobs, exploring and closing the world was interesting and addictive at first, but now... it’s a complete nightmare and in order not to do this, you look for reasons not to go there. In essence, this is all done in order to knock out this or that character or weapon (spoiler is not a fact that you will be lucky to knock out exactly what you want).
In a nutshell, you grind just to suppress your desires for a cool character and make him as strong as possible.
Not everyone agrees with my opinion, but the conclusion is this: Guys, don’t waste your time on this game, even though the game is made pretty well, because there are much more interesting games (well, on PC and consoles for sure). And lastly, DO NOT SPEND YOUR MONEY ON THIS GAME, better spend your money wisely, for example on books such as “The Witcher”, “Blood, Sweat and Pixels”, “Metro”, etc. (this is if you are interested in games, although here there cannot be other people).