The Stamina changes didn´t made the game more Challenging, only more tedious.
The game is still Ultra Easy and it will stay so easy as long as people pretend that tedium adds difficulty.

A better challenge would be Enemys that move more intelligent and different (Climb and jump from trees, fly, Dig and attack by jumping out of the ground,....)
And enemys that need tactics to be defeated, like there is only one of 4 Stages the enemy have in that you can do damage.

Forcing the player to wait for a Stamina bar to refill is no Challenge, its only pathetic