If you change the browser monospaced font, this will also change the font printed by the "write" block. This means that some projects might not work for some people, for example if the "touching colour" block is used.
Hmm, the color should always be the same as the pen color. Changing the font itself could definitely have an impact on something like spacing, but as long as your browser's monospace font is truly monospaced it should all work just fine.
wow... I didn't know that