-Vertical player movement: not much to say, added vertical input and an area boundary to move, i used a variabe zBoundary with absolute values to move the area towards the camera to have it between Z:0 and Z:20 or so.

-Aggressive animals: added a switch case with random function for each side and modified the area and rotation (you will need to look up, how to "add" the rotation to the current object's rotation)

-Game user interface: i don't know why this is considered "hard", as it is just more Debug logs, its not really a user interface. i just added some lines in the collision detection and outOfBounds script.

-animal hunger bar: this was pretty hard, i had bugs, that the hunger bar wont fill, after hiting another animall, or that the next animal dissapears instantly after one hit of the previous one. this wsas due to selecting the right instance in the script. making them point towards the camera was easy, creating the canvas and slider was pretty messy and somehow buggy.