for the desert path, you need to activate the three ice stones around to open the temple. after nuru is left alone, he has to go back and find boris to learn new magic, to activate the ice stones
There was only an optional boss to fight in the ice temple. In any case, the fight system is kind of broken since I didn't spent too much time on it. This game was a birthday present for a dear friend, and I only released it because to have it somewhere, I'm glad people can enjoy it a bit even then. :)