So, i have myself noticed that the Challenges are not that fun. Enemies only get buffs, thats all. so, i updated the game and made changes to Challenges and here the list is:

-Challenge 1: Now enemies drop a special 40 cent coin. This means that the money buff got from 0.10€ to 0.40€.
-Challenge 2: Now all enemies drop tier 2 bread, which makes the whole challenge easier.
-Challenge 3: Now you also get the energy drink buff.
-Challenge 4: Now you also get healed by one health point.
-Challenge 5: You start with a bottle and get a new one every minute.
other changes:
-Regenaration Juice stops trying heal you if your health is full and will continue when your health is not full.