I've already made a post about this on Newgrounds itself, though with no luck.
I'm also sorry if this is not anybody's expertise, but I have nowhere else to go, as no one else online has seemed to document this.
These are the errors I receive while previewing the game:
Failed to load resource: the server responded with a status of 500 ()
Uncaught ReferenceError: Engine is not defined
I made sure to rename the html file to index.html, but I still get the same error.
Apparently you are supposed to have all resources at the root of the folder, but since Godot packs it into a .pck file with no alternative, all that are in the folder are these:
I have no idea if it is the .pck creating the errors or something else, because it only ends up uploading around 5 bytes of data. Any amount of help on this would be appreciated.