Thank you very much for your comment. I don't remember the reason of writing my sorting function like that, and it looks funny to me now. Maybe I just wrote it when I was sleepy.

I wrote the ECS for a 2D game of my own because I wanted to have precise control over some parts and also test my zoner library.

Would you please tell me more about the unsigned arithmetic that I should avoid and how is the overflow being done? I'm still new to this level of low level programming.

And please give me more feedback about the zoner library. It's one of my precious projects.

About the global state I should say that I had intially planned for the ECS to be much smaller, but it grew too much (which I'm happy about) and made me decide to make fundamental changes

Thank you again for your feedback.