I wrote a casual Android game using art/sound all from Open Game Art:

https://play.google.com/store/apps/details?id=uk.org.opencamera.hexabots

It's a "BSD Robots" game, with added hexagonal board (though you can switch to classic squares if you prefer). It's my first game for Android using Java (as opposed to C++/SDL).

List of assets used at the time of writing:

https://opengameart.org/content/bomb-1 by GrumpyDiamond under CC0.

https://opengameart.org/content/​droid-the-android-mascot by creek23 under CC BY-SA 3.0.

https://opengameart.org/content/more-explosions by StumpyStrust under CC0.

https://opengameart.org/content/​miscblooddecalparticles by Duion under CC0.

https://opengameart.org/content/gui-buttons by Scribe under CC BY 3.0.

https://opengameart.org/content/​mechs-64x64 by Skorpio under CC BY-SA 3.0.

https://opengameart.org/​content/bombexplosion8bit by Luke.RUSTLTD under CC0.

https://opengameart.org/​content/footsteps-leather-cloth-armor by HaelDB under CC0.

https://opengameart.org/​content/level-up-power-up-coin-get-13-sounds by wobbleboxx.com under CC0.

https://opengameart.org/​content/machine-shutting-down by Cough-E under CC0.

https://opengameart.org/​content/up-3x by qubodup under CC0.

https://opengameart.org/​content/teleport-spell by Ogrebane under CC0.

Thanks to all those authors!