Inventory Issues:
Not drag and drop but rather click to click.
Ran out of time to change mouse icons on click, which would have made it easier.
Freeze potion can not be added to the throwing inventory slots.
Tutorial didn't go through it due to time, (We're Sorry)
Picking up items goes to the first empty slot and does not try to stack first.
Other bugs:
Letting the wall die and then use a repair potion glitches the wall so you can't lose.
Note: Due to designing the game and knowing how to use the inventory system due to programming it. We apologize for the lack of clarity.
Building a Free to use Inventory System on GitHub right now for version Unity 18.2.0f2, should be completed within the week, fully tested by 2/1/2019.