Sorry, this seems like a bug. If the button doesn’t work then it’s impossible. You aren’t missing much.
Out of curiosity, what browser and OS are you using? I only briefly tested on Windows 10 with Firefox, Chrome, and Edge.
Viewing post in Just Another (Sad) Visual Novel jam comments
Thanks for giving it a shot! I might try to track it down sometime.
I wonder if it’s a weird monitor/resolution interaction as well. I hard-coded the game to an 800x600 resolution. Seeing the 3D background in your screenshot isn’t a good sign and I’m suspicious of the fact that the non-functional button is near the bottom of the original scene.