The game is not that difficult. I'm not master of this type of game, but I still won the custom classic mode and custom mode on hard difficulty. Even got 3X and 4X achievements in custom mode (4X: choose 4 heroes of the same color to win hard game). The balance of the game is well, and the process of game is indeed not that easy, and sometimes need some luck. Because the player has the ways of healing and defense, it is normal that the damage is not as high as that of the monster.