so, question, do nonbinary x woman relationships count as yuri for the purposes of this jam? (The game would also have other prominent, more traditional lesbian relationships)
Yes, that definitely counts! In general our intent is to be inclusive whenever possible.
If in doubt, you could ask yourself “Does the woman in the nonbinary x woman relationship think of herself as queer/gay/sapphic?” If the answer is “yes” then it’s even more suitable 👍