Use WASD, mouse controls are still work in progress. Also, if you're stuck in mark's room, it's because you can't move there and have to use the door to leave the house
That doesn't seem to work either. What seems to be happening is that after Tate tells Mark to go to the gym, I get the text prompt that tells you how to move Mark but only the words seem to disappear. The black opacity remains and I have no control over the character.