I went to have a look at your game, I'm afraid it didn't run for me.
Is it supposed to run with only the .exe file, or does it require additional data? You should be able to tell from your Export folder. If there is a .PCK file and other information in the Export folder created by Godot on export, you need that information to run the game.
If it does need more information, you should be able to add all the data into a Zip file for uploading.