I really like the atmosphere that the music and visuals create, its really unique! Its just a shame you didn't get to fully realise your idea. I didn't really get what I was doing and I think I saw a burger at one point? Besides that, it would great to see this project get a bit more time put into it to fully realise the potential. Good job!
(P.S I think the issue that your having with Fullscreen is because your using the itch.io Fullscreen button and not the native unity one. You can just untick the box in the itch editor to remove their faulty button, hope this helps)