How to make a platformer series

Hello! I have been preparing for a while for this tutorial series I am going to make. I will go through the process of making a simple platformer from start to finish. Before I did this I wanted to see if anyone had a specific art style or world they would like to see. I will be using UE4 and Blender and plan to post it on Udemy. Give me any ideas or things you feel like learning! I start development on the 13th.