Ah, thank you!
I missed setting up the fullscreen option and don't think I'm supposed to adjust that until after the jam, now. : / I will definitely set it afterwards. If you have the option to make your browser go fullscreen, i.e. by pressing F11, I think that's the only option for fullscreen in the browser at the moment. Sorry about that!
But anyway thank you so much for your feedback, I'm very glad you liked the content ^_^