If you've used it, attribution is required.
If you've created a new separate artistic element from it, you must distribute your contribution.
It comes down to how you are using the font. From the
ShareAlike — If you remix, transform, or build upon the material, you
must distribute your contributions under the same ...
Is attribution sufficient for a CC BY-SA 3.0-licenced font in a video game? Is it enough just to credit the creator?
Do I have to sell my game under the same license?
The web clearly states "the material".
Here, the material is the font. If you only use the font in your game, you only need to give the appropriate credit:
You must give ...