Untitled

*Code*
```
import pygame
import random

Window dimensions
WINDOW_WIDTH = 800
WINDOW_HEIGHT = 600

Block dimensions
BLOCK_WIDTH = 20
BLOCK_HEIGHT = 20

Colors
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
GREEN = (0, 255, 0)

Player properties
PLAYER_WIDTH = 20
PLAYER_HEIGHT = 20
PLAYER_SPEED = 5

class Block(pygame.Rect):
    def __init__(self, x, y):
        super().__init__(x, y, BLOCK_WIDTH, BLOCK_HEIGHT)

class Player(pygame.Rect):
    def __init__(self):
        super().__init__(WINDOW_WIDTH / 2, WINDOW_HEIGHT / 2, PLAYER_WIDTH, PLAYER_HEIGHT)

    def move(self, dx, dy):
        self.x += dx
        self.y += dy

def draw_window(window, player, blocks):
    window.fill(BLACK)
    for block in blocks:
        pygame.draw.rect(window, GREEN, block)
    pygame.draw.rect(window, WHITE, player)
    pygame.display.update()

def main():
    pygame.init()
    window = pygame.display.set_mode((WINDOW_WIDTH, WINDOW_HEIGHT))
    clock = pygame.time.Clock()

    player = Player()
    blocks = [Block(random.randint(0, WINDOW_WIDTH - BLOCK_WIDTH), random.randint(0, WINDOW_HEIGHT - BLOCK_HEIGHT)) for _ in range(10)]

    running = True
    while running:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False

        keys = pygame.key.get_pressed()
        if keys[pygame.K_LEFT]:
            player.move(-PLAYER_SPEED, 0)
        if keys[pygame.K_RIGHT]:
            player.move(PLAYER_SPEED, 0)
        if keys[pygame.K_UP]:
            player.move(0, -PLAYER_SPEED)
        if keys[pygame.K_DOWN]:
            player.move(0, PLAYER_SPEED)

        draw_window(window, player, blocks)
        clock.tick(60)

    pygame.quit()

if __name__ == "__main__":
    main()
```