Hi, and thanks for your reply. I honestly don't remember what went wrong and didn't look at the console. I can tell that I chose "export project" and I renamed the main file to index.html. But then itch only showed a black page. I also chose "kind of project" as html and ticked "this file will be played in the browser" and saved changes. I don't remember if I put all files in the same folder.
That said, it is too late now, maybe next time. :) But thank you again for replying