Huh. That's actually pretty neat. Haven't played it in over a month, and it seems I've gathered a couple dozen Stars since last time, but my newest two levels have been doing badly. I'm also puzzled by the fact people apparently find some levels difficult where I thought they would be easy or the other way around. Also it's strange how the difficulty level is determined. I have a level with 10% being "normal" and one with 14% being "hard". There's probably some kind of algoritm taking number of players and completions into account, but still...
I'll get back to it sometime soon. I have a couple new ideas, I think. Added the themes to all my levels at least, and here's my profile: https://supermariomakerbookmark.nintendo.net/profile/S.Peelman