This was overall a nice level... except that getting the key to enter an unforgiving sublevel wasn't. By default, you required both Yoshi and a feather to get the key. But now that a Blue Koopa is provided, you can use it to fly, and no longer need a feather for that. And since the secret sublevel was extremely unfair and uninteresting, it was removed. The door was replaced with a keyhole. Good enough for a secret exit.
And new aesthetics! Magi's new cloud BG, Falconpunch's cloud FG, Dr. Tapeworm's industrial/metallic tileset, and pipes drawn by me, based off of the old ones.