I'll definitely have to check out the levels in this thread now that I'm back into playing the game again. Once I do I will certainly give my thoughts!
I have some levels of my own uploaded as well that are mainly one-offs. (although I'm looking to make a full super world) I'm no level designer but I'm pretty happy with them and would appreciate some feedback! I have ten uploaded but a couple of my favorites:
Soda Pop Pipes: 6KY-GMQ-SCG
Perilous Cave of Wonders: NJ0-35D-H3G
Poki Poki Panic: 7G4-YHC-DPF
Chaotic Neon Madness: 91T-9BG-YQF
Space Zone Neo: MH0-C5P-CVG
I have others with weirdly more likes on my profile if you want to check them out too lol.
I played Soda Pop Pipes last night. That was a really fun and creative level. Nice 10 Coin placement too, by the way. After completing it, I ended up playing it some more until I set the World Record on it.