I found a couple bugs, it is related to the 'soul' system, I checked the command blocks, there is no condition to get a soul, so it doesn't matter if you do not have emeralds, you'll still get free souls, also the wither flower should cost 5 souls but it only cost 1, and you can have negative souls so it is practicaly free.

In the other hand, the game needs something else than just killing zombies, it turns boring in minutes.

-Keep on working till you turn into the best