After fumbling around with trying to get the Newgrounds API to work with my game for what can only be described as an embarrassing amount of time, I found what I was doing wrong (using an outdated index.html) so here's what you gotta do:

-follow everything here: newgrounds api in godot - by 3amsoda (thanks 3amsoda I would've been lost without you)

-replace that index.html with this index.html (newgrounds.com)

-that's it

-as I said, embarrassingly long.

Have fun, go off to your holiday to the white cliffs of dover or whatever