Update: I was playing it in Firefox when I had the black screen issue; when I switched to Safari it worked great -- and it's a great game! I loved the artwork and your colliders on complex surfaces functioned very smoothly. It was a fun game to explore -- nice work! (In case it's helpful for debugging, I've played dozens of in-browser games from this jam in Firefox with no problems. There was one game where a functionality in the game didn't work for me, but I just now went back and tested with Safari and it didn't fix that issue, so unrelated).