Somewhat interesting, but terrible execution.
The entire game makes no sense. It’s ruined by pay to win elements such as: 1) most powerful characters require absurd amounts of money to play and free characters can never surpass them; 2) costs absurd amounts of money to revive (‘free’ characters cost $2 per level, and it only goes up exponentially depending on the grade or type of character); 3) literally everything in the game costs money. Want to revive your ally? Cha-ching! Open your own dungeon? Cha-ching!
Not to mention the fact that a level 48 character (one of the highest in the game) is unable to take on more than 5 level 10-15 characters in the starting area even though their gear is significantly better.
A three skeleton boss can’t even take on a one star hero healer and a two star tank with a few randoms, yet apparently the game is balanced.
Essentially, the game makes no sense, and everything is one dimensional. Whether something is strong or not depends on what suits the author’s plot.