It's the same game. The exact same game. 4 creature types, spend money to spruce up your castle, forge new weapons, armor. Really. You even have the same set of armor.
The only difference/improvement from the first is occasionally your browns can ride wolves to move faster and there are also stationary constructions like ballistae and catapults you can pilot. There's also a ship you can sail around in one level.
If you liked the first and played it long enough ago that the gameplay will be somewhat fresh and new,