@Ink Gunner Emily I left a comment and a star on your new level. Very fun!
Well, it's time to retire some stages I thought were not very good. I have removed Short Cavern, Short Castle, Fly High with Raccoon Mario!, and Choose Your Fate.
Here's what I replaced them with.
EBA8-0000-0067-0044
Short Cavern (NSMBU): A re-do of my World 1 cave level. It's extremely easy and short, and designed for beginners so experienced Mario players will be bored from this level.
534B-0000-0067-018D
Short Castle (SMB): A re-do of my World 1 castle level. No more cryptic secrets here. It's extremely easy and short and designed for beginners so experienced players will be bored from this level. A Luigi costume is hidden is the level somewhere.
6092-0000-0067-0336
Goomba's New Shoes (SMB3): A level featuring the Stiletto Goomba. There's enough coins in this level for a 1-Up. Very basic otherwise.
866B-0000-0067-0468
Hammer Bros. Heights (SMB): Thank you for the inspiration
@ILikeKirbys this level features the Hammer Bros. Though there are not many of them.
The level is rather straight forward and a Rosalina Costume is hidden somewhere in the level.