Python文本类躲避游戏：实现多物体同时下落及代码优化需求

我是Python新手，正在通过Grok学习编程，制作了一款文本类躲避游戏。当前游戏仅能实现单个标记为c的物体下落，希望对游戏进行以下修改并优化现有代码：

• 支持多个物体同时下落：每次玩家按a或d左右移动时，所有物体下移一行
• 物体触底后消失，并在顶部随机列生成新物体
• 若玩家被物体击中则游戏重启
• 物体触底时得分加1

当前代码 #

import random
# Sets up Board
grid = []
x = 1
cx = random.randrange(3)
cy = 0
for i in range(4):
  row = []
  for j in range(3):
    row.append('.')
  grid.append(row)
for k in range(3):
  grid[3][k] = '='
grid[2][x] = 'x'
grid[cy][cx] = 'c'
# Draws Board
for row in grid:
  print(''.join(row))
# Movement (Left or Right)
d = input('a or d? ')
while d:
  dx = x
  cdy = cy
  if d == 'a':
    x -= 1
    if x < 0:
      x += 1
  if d == 'd':
    x += 1
    if x > 2:
      x -= 1
  cy += 1 # Makes objects come closer
# Checks if objects are touching floor and if so creates new object at random column
  if cy > 2:
    cy = 0
    grid[cdy][cx] = '.'
    cx = random.randrange(3)
# Ends game if player gets hit by object
  if cx == x and cy == 2:
    if x != dx:
      grid[2][dx] = '.'
    grid[cdy][cx] = '.'
    grid[2][x] = 'x'
    grid[cy][cx] = 'c'
    for row in grid:
      print(''.join(row))
    print('You got hit by a car :(')
    break
  if x != dx:
    grid[2][dx] = '.'
  grid[cdy][cx] = '.'
  grid[2][x] = 'x'
  grid[cy][cx] = 'c'
  for row in grid:
    print(''.join(row))
  d = input('a or d? ')

现有棋盘样式 #

.c.
...
.x.
===

其中x代表玩家，c代表下落物体。

期望的棋盘样式 #

..c
...
.c.
...
c..
...
.c.
.x.
===

内容的提问来源于stack exchange，提问作者Gwotchya