Heya, the windows build didn't work because it didn't have all the necessary files. It's always a good idea to reserve some time near the end of a game jam to have a friend try to download what you uploaded and play it. That way, you'll be able to ensure it works and potentially get some valuable feedback while you can still make changes. I went ahead and found a tutorial that might help with uploading for windows:
I'll try the WebGL version soon(tm)