Looking for feedback on these rejected icons.

Hello guys, I have submitted these icons and got rejected. I’m trying to figure out what could be the cause of rejection. There is one possible reason I’m thinking

Few icons: So initially I submitted 12 icons. My idea was to submit the first set of icons to check if the quality of the icons is optimal. And then update them version by version. I have more than 50 icons on the pipeline for this set.

Also, another thing. I not planning to design an icon set with 1000-5000 icons. I’m planning to keep’em small, simple and quality full. Maybe max 50 icons in one set. Do you think this is optimal?

Do you have any other ideas of why these icons are rejected?
P.s. I can send a sample SVG icon from the set so you can better investigate.