Click green flag. Use wasd keys to move. a and d rotate. Pressing space on the door (access the door by holding w until it shows up) the will open a dead end to a room.
This originally was supposed to be a 3D maze game. I ended up quitting on it because of my lack of knowledge of positioning (inside the maze), and by its cheesy graphics including turning. This then inspired me to make the 3D Room Simulator: https://scratch.mit.edu/projects/80174184/ .