Can someone help me? I complete 2 side qest and now im stuck. I dont know how upgrade fox, and how destroy brown rocks arownd chests. Maybe i miss something? 

Talk to some people in town. They might have some hints. You'll get an item in some caves that allows you to upgrade the animals.

Thanks for help.  I'm just blind, I didn't notice a passage in one of the caves. I hope the game will be released in full access, because it is very good.