Finally got enough stars to unlock an extra 10 slots, so hurray. Also, made some more levels that exist:
Lights Out - 6E5B-0000-0097-6A09
I would never betray you - 70FA-0000-00A2-C5E1
A couple of levels that make use the "block-stacking glitch" (most infamously used for making invisible blocks).
Chomp Cooperation - 576E-0000-00A5-8CE0
Sort of a puzzle-like level that involves Chain Chomps. At this point, nobody's cleared it, so I'm not sure if it's too hard, or if the solutions are too obscure.
Catch That Magikoopa! - 3090-0000-00BA-70F3
A stage similar in concept and difficulty to the wandering Hammer Bro stages from SMB3, except with a Magikoopa.
Completely RNG - B4E3-0000-00BA-77FB
Magikoopas have a 1-in-5 chance of turning a block into a mushroom. That's the entirety of the level. I actually uploaded this stage some time back, but I felt bad about it and took it down. This version is slightly modified from the original... but it's not all that much better.