I really was offended that they changed the story so much from the game. There was no reason to. NONE. The game slowly develops characters, they change over time. Some characters are introduced late, and leave soon, but are still dear.
In the anime they introduce all the main characters in the first two epiosodes. WHY!? They did not need to be introduced so soon. They even left out one of the most impactful lines of the game. For no good reason. Instead they just added needless stupid filler.
I am disappoint.