Ok, it seems to work now. I don't know why. I changed nothing on the game itself.
This is what I did:
- upload the game
- click "this file will be played in the browser"
- save & view the page
- doesn't work
- uncheck "this file will be played in the browser", save & view the page
- check "this file will be played in the browser" again, save & view the page
- and it works.
Whatever. Thanks anyway! I can't even believe it works now, lol.