Once again
You don't just uploadd the .exe file. please refer to this image: 
You need the whole file structure. I'm exited to see what you made!
A member registered Oct 30, 2023 · View creator page →
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You not only have to post the Unity launcher for the game but also all of the files.
I've posted an image for the game Milkman Karlson, so you can see the kind of files you need to submit. To do this, you have to zip them into a file and submit that. I hope this helps, and I'm excited to see what you've created!
This is Milkman Karlson if any of you are interested: Milkman Karlson by Dani (itch.io)