1. When you make your zip file for UL make sure you have all the files to run the game. Pick a folder and unzip into the folder and run it to make sure it works
2. When you UL to itch.io make sure you can DL the zip file. There is a setting on the bottom that defaults to draft. You need to change that to public

1. DL the file from itch.io and run it make sure it will run.

2. If you change something then go through the entire process again. When you UL to itch.io again make sure you delete the old zip file as they keep them all.

Every year there are so many developers that miss out because they forget a few little things like this. I know them because I have done them all.