[centerorbit]

Creator here: Yes, that's bugging me too. I think the default "monospace" font on Android is def not monospace. I'm going to look into embedding a font instead.

[mattowen_uk]

On Chrome (Windows) the box frames at the bottom are no right-aligned either.

Have you thought about using <canvas> and just writing OEM DOS style characters where they need to be like some sort of obscene franken-video-buffer?