This game is a damn popularity contest, plain and simple. Be famous enough and whatever shit you put out will be starred and played thousands of times by rabid morons.

Just look at any big livestream where the streamer is making their own level. It's always pure Kaizo-trash that's no fun to actually play (thanks for starting this trend, Panga, I hope you're proud of yourself), but they get thousands of stars and plays.

A thread on GameFAQs suggested that if you're not getting stars, either make degenerate automatic levels or make your levels easier. I did recently and made a SMB3 level that's almost babyish in difficulty and no harder than an actual SMB3 level. No difference, because I'm not some internet celebrity I get skipped if they die even once.

I've had this game for a while, made eight levels (took two down for now though), and I have a grand total of three stars. Three. And they're not super hard Kaizo bullshit... but you can actually die and that's a big no-no if you actually want people to play and like your levels, it seems.

TLDR: Don't bother making levels unless you're already famous or if you want to degrade yourself by making automatic levels, because nobody will care about or play them.