It seems I screwed my final build and somehow didn't test it. Quite embarrassing. I wrote a notice on the game's main page. Please read that for more details. Apologies.
I had a similar problem, I forgot to include a file in my submission that the game needed to run. It ran on my computer because I already had that file so I didn't notice until someone else downloaded it after the deadline. Pretty unfortunate but at least we both know now.
