Your proposed modifications sound good, though please be specific in your final submission what modifications to the GUI you made and be aware that if they are extremely simplistic changes (color swaps only for the provided prefabs) you are likely to not earn full points. Also, be specific about what new enemies you created and what new behaviors they have, these should not just be the provided prefabs without any changes. Each new level you make can be a significant modification so long as the levels are all substantially different from each other.