Follow the Circle

import pygame

pygame.init()
WIDTH = 970
HEIGHT = 600
window = pygame.display.set_mode((WIDTH, HEIGHT))
red = (255, 0, 0)
green = (0, 255, 0)
run = True
speed = 2
x, y = 100, 200
dx, dy = speed, speed
count = 0
clock = pygame.time.Clock()

color = red
while run:
    clock.tick(60)
    window.fill((0,0,0))
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    x += dx
    y += dy
    circle = pygame.draw.circle(window, color, (x, y), 40)
    m = pygame.mouse.get_pos()
    r = pygame.Rect(m[0], m[1], 10,10)
    pygame.mouse.set_visible(False)
    rec = pygame.draw.rect(window, (0, 255, 0), r)
    if not circle.colliderect(rec):
        # print(count)
        count += 0.1
        color = red
    else:
        color = green

    if circle.left <= 0:
        speed += 0.5
        dx = speed
    elif circle.right >= WIDTH:
        speed += 0.5
        dx = -speed
    elif circle.top <= 0:
        speed += 0.5
        dy = speed
    elif circle.bottom >= HEIGHT:
        speed += 0.5
        dy = -speed

        print(speed)
    pygame.display.update()
pygame.quit()