Tip: Remaking levels from other Mario games is strongly discouraged, especially popular ones (World 1-1 from SMB or SMB3, for example), as their over-presence in Mario games, official or not, often makes them uninteresting to play.
A very simple hack with some stages with empty sessions. I liked the customization and the gradient colors in some stages, but the gameplay is very empty and I noticed an error. When you earn 100 points on the Finish Line, the Bonus room has no music. Overall, 3/5.