Also I'd recommend to pack the pck file and the executable in one zip file, so people can download all required files at once. Thanks for the web build bdw! Your first game on itch? If so, congratulations!
Thank you very much for the tip with the zipping (did not think about this in my hurry...).
No need to thank for the web build: I always wanted to try the html export functionality of Godot. But it always requires the files to be on a server (and a local one is to much of a hassle to set up). So the game jam upload to itch.io was a welcome excuse to try it out :-)
Yes, it is my first game on itch.io and the first Godot game I brought to a somewhat playable state.