I played through Illyria last night and had a great time—thank you for creating the civ!
I'd love to share some feedback on the unique unit, the Oikaiadēs. By mid-antiquity, the unit feels less useful after its settlement discharge. At that point, I've typically already explored the area, and since it is coastal-only, it feels less versatile than a scout, which can traverse both land and water by early antiquity. As a result, I often ended up deleting the unit after founding a settlement. I think the Oikaiadēs would be more valuable if it had offensive capabilities or another function after deploying a settlement. Simply acting as a scout doesn’t provide enough justification to keep it around.
That said, I really enjoyed how Illyria encouraged me to think more strategically about navigable rivers, and it was a perfect fit for the archipelago map. I’ll definitely play them again! Thanks again for this civ and the others in the Civarium—I’ve downloaded them all and look forward to trying them out.