I have the same error as Mattis Kugelstadt or Error Failed to initialize graphics. If you have some options to fix it I'm happy to give it a try.
Viewing post in lost in the woods jam comments
Sorry to hear that!
Which Browers are you using? If it is a browser problem, maybe try Microsoft Edge? If it is just the error of using F4 for fullscreen, you can skip that and continue the game on regular screen.
Otherwise try refreshing the browser (which you probably already did ^^), but aside from that i'm currently not able to help you.
I am very sorry!