The game didn't open in fullscreen. I played on Chrome. Oh I missed the R button. xP
Viewing post in Ring of The Phoenix jam comments
I checked on it again. I have seen when you click on the game window once it just happens to go to fullscreen. If you exit fullscreen there is probably no way of reactivating fullscreen again. I think you can set the presentation Template in unity to default instead of minimal if you want people to just fullscreen now and then.