I don't get it. In the first level I just fall down to the left or right and can't get any further.
What's your OS?
The exporting seems to have made you not be able to complete a level, no idea how to fix that
That happened to me when I tried uploading a game I made during a game jam
That's the reason I don't do game jams anymore.. at least not with godot
Windows 10.
Should work now, each level is its own file in the zip
same
Try now, made each level its own executable in the archive