Basically the issue is clearly visible in the following screenshot:
This happens when running it both via Safari directly and from saving it to an icon on my home screen. I can double-click to add stuff, and there is an invisible box I can double-click on the left side that allows me to edit a Sprite I added. But otherwise it’s effectively impossible to do anything. The Event screen is also a bit messed up, and I can take a picture of that if it would be helpful. (but it looks like I can generally interact with that screen, so I’m not as worried about it right now)