Tell us the goal of the game. This doesn’t mean there is a final end achievement we work towards, but what the long term objective is. The first time I played with my birds, I didn’t understand where it was all going.
I do like the way each level gives you new opportunities to earn more riches through different kinds of gameplay. Those new enhancements need explanations like where you will experience them (I was pretty confused over the whole Gold pig and thief pig thing until it was explained to me).
The Oinkbowl isn’t just about earning your profile XP to level up, it is also about those skeleton keys – which are really, really important to earning extra special eggs and coins in the pyramid from time to time. I took me 10 levels to figure that out.
Explain the Friend system in much more detail – like why it is beneficial and how those hearts work (free eggs?)
Explain the Clan system in much more detail – like why you want to donate coin to XP up your clan (big unknown still).
Explain leveling up and evolution in more detail.
I think you have to balance out the tutorial so explain just enough to get newbies started but not giving away all of the strategies that make learning a new game fun.