I think that your modifications are headed in the right direction! I do have a couple of questions:
- Will the background music that you add be custom-made? I'd highly recommend doing this, as it makes the game significantly more customized to your own personal vision.
- How will you modify level 2? What types of obstacles and challenges will you use to differentiate it?
- What elements inside prefabs will you use? Are you thinking of using them as decorations, or using these to make new items/abilities/scripts?