Yes it has
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Just to be sure the rules are clear. You must credit each individual art work from OGA that your game uses. Credit should include the name of the work, the name of the artist, a link the OGA page where you got the art, the name of license that you are using the work under.
Here's an example from my game Word Dug (https://withthelove.itch.io/worddug) submitted to the OGA Summer Game Jam 2020:
(apologies for all the extra vertical spacing here, I pasted into itch.io and this is just what I got and i couldn't find a way to condense it back together)
Art from the following works was used in the creation of this game.
Modifications were made.
The Humble Food Pack
https://opengameart.org/content/the-humble-food-pack
used under terms of
CC-BY 4.0
http://creativecommons.org/licenses/by/4.0/legalcode
Good Neighbors Pixel Font
by Clint Bellanger
https://opengameart.org/users/clint-bellanger
https://opengameart.org/content/good-neighbors-pixel-font
used under terms of
CC0
http://creativecommons.org/publicdomain/zero/1.0/legalcode
Three Little Bitmap Fonts
by Michele 'Buch' Bucelli
http://opengameart.org/users/buch
http://opengameart.org/content/three-little-bitmap-fonts
used under terms of
CC0
http://creativecommons.org/publicdomain/zero/1.0/legalcode
Mug Stage
http://opengameart.org/content/8-bit-level-music-mug-stage-sewer-pipes-undergrou...
by Volcano of Bears
used under terms of
CC-BY 4.0
http://creativecommons.org/licenses/by/4.0/legalcode
Pound the Stage
http://opengameart.org/content/8-bit-level-music-pound-the-stage
by Volcano of Bears
used under terms of
http://creativecommons.org/licenses/by/4.0/legalcode
Midboss Blues
http://opengameart.org/content/8-bit-boss-music-midboss-blues-normal-speed
by Volcano of Bears
used under terms of
CC-BY 4.0
http://creativecommons.org/licenses/by/4.0/legalcode
Vulnerability - Fast Version
http://opengameart.org/content/8-bit-level-music-vulnerability-fast-version
by Volcano of Bears
used under terms of
CC-BY 4.0