CirCuitPython green square fall

code.py

import board
from time import sleep
import displayio
from adafruit_display_shapes.rect import Rect
from adafruit_matrixportal.matrix import Matrix

# --- Display setup ---
matrix = Matrix(bit_depth=6, width=32, height=32)
display = matrix.display

# Make the display context
splash = displayio.Group()
display.show(splash)

# Make a background color fill
color_bitmap = displayio.Bitmap(31, 32, 1)
color_palette = displayio.Palette(1)
color_palette[0] = 0x000000
bg_sprite = displayio.TileGrid(color_bitmap, x=0, y=0,
                               pixel_shader=color_palette)
splash.append(bg_sprite)
###########################################################

rect = Rect(10, 0, 4, 4, outline=0x00FF00)
splash.append(rect)

while rect.y < (32 - rect.height):
    sleep(.2)
    rect.y = rect.y + 1

rect.fill = fill=0x00FF00

while True:
    pass