Short answer, no, you cannot use paid assets you've bought. Long answer, it depends on whether your game is still functional if the asset is removed from your game. For example, Gaia is a tool to sculpt Unity terrain. You can delete Gaia out of your project after you are done because all it outputs is Unity terrain.
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Okay.
I didn't see that explicitly stated anywhere in the rules, and I guess I misunderstood the little part at the bottom about libraries or whatever.
So - not paid assets, but free assets are allowed? Because yeah, I have to scramble now, likely starting from square one.
But thanks for the clarification.
If I recall correctly from the livestream where they announced the gamejam, the idea is to spread knowledge.
You share your code for other gamedevs to study and learn from it. To know how things work or how someone did something in their game. The assets are included just to make sure the person studying the project can build it on their own and have a playable piece.
If the free assets you use don't allow redistribution, you will have to remove them from the source files and leave a text file with links to the websites where they can be downloaded, so that you don't get in trouble with the asset providers.