OGA doesn't seem to be mentioned. How do you know there are bonus points for using oga content? 

OpenGameArt is mentioned in the 'Calinou awesoem Gamedev' link under 'Assorted Assets'

https://notabug.org/Calinou/awesome-gamedev/src/master/README.md

I think you can get bonus points for using 'OpenSource' Works and 'Creative Commons' Works, Using assets from OGA would count towards bonus points. :)

Possible Open Source KarmaStarsOpen source game engine3Open source tools1 per toolGame runs on an open platform1Source repo with README1Created using an open platform1Creative commons assets1

OGA really doesn't like copy and pasting stuff does it.