So cute, I'm glad I took a moment to download it! Unfortunately I got stuck during the 3rd rat balloon cutscene, but I had fun until then. When he says, "LOOK DOWN THERE AT THOSE STUPID FOXES", I can't progress further and there's a big error box behind the dialog saying

This is a fallback bubble, that is not actually connected to any character. In game use the following code to add speech bubbles to a character... etc.