Hey, Eric! So stoked you’re going to be participating in your first jam. Great question. You can use assets from wherever as long as you follow those license terms. Whether you find sprites or sound effects or music, you’re good to use them!

I have a few assets that might be useful on my sourcehut page: https://sr.ht/~ultidonki/

2D walking animations in 8 directions for Pepper, Saffron, Shichimi, Coriander, Camomile, Cinnamon and Spirulina. And a 4-direction walking animation for Carrot. All in the 'Pepper Carrot Farming' project.

I have a 3D walking, swimming and on broom animation for Pepper, plus some un-rigged and un-animated 3D models of Saffron, Shichimi and Coriander in the 'Pepper Carrot 3D platformer' project. They're all .gltf files but let me know if you want the .blend files too. 

All the assets are licensed under CC-BY-SA-4.0+, but I'm happy to re-license these ones above under the CC-BY-4.0 license, same as the license the webcomic is released under if someone asks. Let me know if you want me to do that, otherwise they'll stay as CC-BY-SA for now.

I think I had the same thing, I believe it's at the end of the edit game, there is the visibility. And when you first add it, it is not public, so you can't see it in the submissions or something. And when you make it public, it appears. Yesterday I panicked because of that