I'm not going to imitate every level of a Mario game, if thats what you're worried about. Theres going to be a story behind it and other NPC to talk to like in other KS levels. For example, after I'm done with my other tilesets you will be able to get inside Mario's House and the castle in the end of the level. Inside the castle, you will find another doorway to get to another level or world.
My plan was to make the first few screens to look like Mario's "World" and then make a transition to the KS "World." Again, I'm still trying to think about a story and how I would execute this level. I'm open to suggestions on how to make this better.
So, it will still play like a KS level but just with smb style graphics. You'll not see goombas and piranha plants in every level (just the first few screens). If I wanted to create a Mario game imitation, I'd rather use a Mario engine or something similar.