Player's position is not updating after they choose a direction to move in. Why ?

import random

CELLS = [(0, 0), (0, 1), (0, 2),  #CAPS = Constant
         (1, 0), (1, 1), (1, 2),
         (2, 0), (2, 1), (2, 2)]


def get_locations():
  # monster = random
  monster = random.choice(CELLS)
  # door = random
  door = random.choice(CELLS)
  # start = random
  start = random.choice(CELLS)

  if monster == door or monster == start or door == start:
    return get_locations()

  return monster, door, start ## return monster, door and start if they aren't in the
                                 #same position

  # if monster, door, or start are the same, do it again

  # return monster, door, start

#passes in players current location and there request move direction i.e (0,1) & ('LEFT')  
def move_player(player, move):
  #player is - (x,y)
  # Get the player's current location     
  x, y = player

  #using elif here because only one can be true and they
  ##might not type left, right, up or down so it allows you to
  # If move is LEFT, y - 1
  if move == 'LEFT':
    y -= 1

  # If move is RIGHT, y + 1
  elif move == 'RIGHT':
    y += 1

  # If move is UP, x - 1
  elif move == 'UP':
    x -= 1

  # If move is DOWN, x + 1
  elif move == 'DOWN':
    x += 1

  return player


def get_moves(player):
  moves = ['LEFT', 'RIGHT', 'UP', 'DOWN']
  # if player's y is 0, remove LEFT
  if player[1] == 0:
    moves.remove('LEFT')
  # if player's y is 2, remove RIGHT  
  if player[1] == 2:
    moves.remove('RIGHT')
  # if player's x is 0, remove UP
  if player[0] == 0:
    moves.remove('UP') 
  # if player's x is 2, remove DOWN
  if player[0] == 2:
    moves.remove('DOWN')

  return moves

monster, door, player = get_locations()

while True:
  moves = get_moves(player)

  print("Welcome to the dungeon!")
  print("You're currently in room {}".format(player))  # fill in with player position
  print("You can move {}".format(moves))  # fill in with available moves
  print("Enter QUIT to quit")

  move = input("> ")
  move = move.upper()

  if move == 'QUIT':
    break

  if move in moves:
    player = move_player(player, move)
  else:
    print("**Hey, that's a wall, stop walking into them!**")
    continue

  if player == door:
    print("Congrats you escaped")
    break
  elif player == monster:
    print("Damn dude, you got eaten!")
    break
  # If it's a good move, change the player's position
  # If it's a bad move, don't change anything
  # If the new player position is the door, they win!
  # If the new player position is the monster, they lose!
  # Otherwise, continue