I don't know if it's a Chrome issue, but I could barely see the room. I moved the box to the button, but I didn't notice any difference. It's a beautiful art, though! :)
It's not just Chrome, I had a similar issue in Opera GX. Once I zoomed out the page enough I could see everything though. My experience was pretty similar to yours though, I assume the button would open the door on the right in future. I agree that the art looks very nice though!
You assume correctly I just wasn't able to implement it in time haha. When I update the game the door will work properly lol. Thank you too for enjoying the art. ^^