I have a major question about about my story and I need answers

Hi I'm fallen and I'm writing a story and I have a major question about if using other people's story's as foundation for my own is improper. For example my story and world is built around the world of minecraft diaries season 2 from aphmau. It does not use the same character but premise for characters such as people like the goddess of the world and her powers, the knights that follow the oc, I've taken those and changed them to where there's some similarities but not the same. Powers are similar but also now partially based off of and. The world is full my own and hand drawn maps. Towns are my own. But the base story of the knights and power are based of of some one else's based story. Anyways I was curious if someone could help me just figure out if I'm stealing someone's ideas or I'm in the green.