Hello, I've seen recently a lot of the browser based games submitted directly through ludum dare experience an error, and I just wanna help some people for their games, because I experienced the same issue but then resolved it very eaisly...

When exporting the game to a folder for browser, make sure there is a file called index.html

Then, you have to compress it into a zip file (this is where I made the mistake). I compressed the folder that contained the index.html (i.e. compressing a folder "Game_Name" containing index html). Instead, what should have been done is to first open the folder, then select everything inside that folder, then compress those files into a zip file.

This zip file should then work properly when uploaded... Hope this helps anyone and can make their games more reachable! 😁