Your modifications seem to be headed in the right direction! I do have a couple questions:
- How are you planning on changing the main menu graphics? Will you make the assets you plan on using yourself? I'd highly recommend doing so - it makes the changes much more significant and noticeable.
- How will you modify level 2? What changes will you make to it, and how will it be unique?
- Are you planning on making the background music yourself? As with art assets, I'd highly recommend trying out making music yourself!
I'm looking forward to seeing your final product!