Acutally after playing the tutorial three times I am still not sure what the controls do. Can someone explain how to play?

I watched my girlfriend trying to play this game and she had to give up and return it. bad stuff: - you get easily overrun on easierst difficulty on the first night, you basically need walls and archers on both sides. impossible to accomplish with starter resources - rng in beginning is to high. sometimes you walk in the wrong direction and time loss will kill you - at night 5+ or so enemies come with rams. wtf? turn it down! walls need to feel someone 99% safe - its very unclear when you are allowed to...

I assaulted the main camp thinking there would be a castle after it and a special spot I would need to build the treb.... But it appears I don't need it to win?

Does this game has Co-op like Kingdom two Crowns?

During my first playthrough, I selected Expert difficulty and I wasn't able to progress past the third prompt, asking you to build a wall. When I tried to build the wall, its icon appears greyed out and then makes a noise to indicate I can't build it when attempting to pay. When switching to Normal difficulty I was able to build the wall with no issues. Is this a bug that's only present on Expert difficulty?...