The main difference apart from appearance is that they are comfortable in colder climates. (-22F naked). Tribal goblins (I make the distinction because the game will randomly generate them in the ancients or non-factions as part of incidents) are most xenophobic and have a high % chance of being tough so they're less prone to breakdowns and about 30% tend to be night owls. 20% of the warriors tend have the bloodlust trait.

How do the goblins differ from base humans?

New starting scenarios will be available in the next update. Probably later today or relatively soonish.

Right now you need to use Prepare Carefully, but I will do a simple starting scenario for both tribes.

Please tell me there's a way to play as the goblins and I'm just not seeing it! I've been looking for a way to build my own goblin town but other mods don't work or are really weird with their art.

Yes you NEED core. Core has all the races so they can be shared.

Do I NEED ultima core or can I use this as a races mod?

Thanks!

I can indeed.

Sounds cool, could you share any pictures of the goblins?