The difficulty is just very controllable, there is no chance of stoping the bar in red if it wasnt in purpose. If the enemies could do Stuff that obligates you attacking them, like jumping far every 2 seconds, or charging a dangerous attack, but it must put pression on the player, so it worries more about the enemies than about the bar
There was variated enemies! The skeletons where pretty original, since they matched with the sword mechanic (that is important)
The tutorial was neat