we should use 6 assets from opengameart.org

But I have found an asset-pack there, that is enough for one game!

(https://opengameart.org/content/cold-valleys-winter-themed-platformer-asset-pack)

Yeah, there are a lot of great complete or near complete art packs on OGA but the rules of the Jam call for you to use a minimum of 6.

If you find a sprite/tile pack that has everything you need, you can still use other OGA assets for things like music, sound effects, fonts, etc.