Super Minecraft 3D World

So I've loved the game Super Mario 3D World from the moment I had heard about, and I thought, "Why not make something like it in Minecraft?"  And here it is.

5 worlds are fully completed, and there will be 5 more to come.  This map works best with Minecraft 1.8 and does not require any mods.  Feedback and suggestions are greatly appreciated.  I'd really like some help coming up with level ideas, as I've hit a block in my imagination.

Requirements
~A good processor (I'd suggest at least an i5)
~Vanilla Minecraft
~Make sure command blocks are set to "on" in multiplayer
~1-4 players
~Okayish parkour skills
~A sense of fun

Optional
Optifine (recommended)
Included sound pack (recommended)

To Do
-World 6 (Forest Land)
  6-Castle
-World 7 (Ice Land)
  7-1
  7-2
  7-3
  7-Castle
-World 8 (Fire Land)
  8-1
  8-2
  8-3
  8-Castle
-World 9 (Gold/Iron/Diamond/Emerald Land)
  9-1
  9-2
  9-3
  9-4
-World 10 (Glass Land)
  10-1
  10-2
  10-3
  10-4
  10-5
  10-6
Final Level???