I need help improving my code. It's a basic game where an object avoids stuff coming at it$.$ It$$s a submarine avoiding a red cube. First, I need the object I$$m avoiding to look like a tire instead of a red cube. It should be a perfect circle drawn using pygame.draw not load image, It should look like a black donut and how tires normally look, not a full completely coloured in black circle. Secondly add an ending screen, like Good Try and then display their score and ask them to exit or retry. Third, make the game harder as time goes by$,$ both by increasing the amound objects and the speed of them coming at you.

import sys

import random

import pygame

pygame.init$()$

WIDTH, HEIGHT $=800,600$

SUBMARINE$\_$WIDTH, SUBMARINE$\_$HEIGHT $=50,30$

OBSTACLE$\_$WIDTH, OBSTACLE$\_$HEIGHT $=50,50$

FPS $=60$

SUBMARINE$\_$SPEED $=5$

WHITE, BLUE, RED, YELLOW, GRAY $=(255,255,255),(0,0,255),(255,0,0),(255,255,0),(128,128,128)$

submarine$\_$rect $=$ pygame.Rect$($WIDTH $//2-$ SUBMARINE$\_$WIDTH $//2,$ HEIGHT $//2-$ SUBMARINE$\_$HEIGHT $//2,$ SUBMARINE$\_$WIDTH,

SUBMARINE$\_$HEIGHT$)$

obstacle$\_$rect $=$ pygame.Rect$($WIDTH$,$ random.randint$(0,$ HEIGHT $-$ OBSTACLE$\_$HEIGHT$),$ OBSTACLE$\_$WIDTH, OBSTACLE$\_$HEIGHT$)$

score $=0$

screen $=$ pygame.display.set$\_$mode$(($WIDTH$,$ HEIGHT$))$

pygame.display.set$\_$caption$("$Submarine Game"$)$

font $=$ pygame.font.Font$($None$,36)$

def draw$\_$submarine$()$:

pygame.draw.rect$($screen$,$ YELLOW, submarine$\_$rect$)$

pygame.draw.rect$($screen$,$ GRAY, $($submarine$\_$rect.x $+$ SUBMARINE$\_$WIDTH $//2-5,$ submarine$\_$rect.y $-10,10,10))$

def draw$\_$obstacle$()$:

pygame.draw.rect$($screen$,$ RED, obstacle$\_$rect$)$

def draw$\_$score$()$:

score$\_$text $=$ font.render$("$Score: $"+$ str$($score$),$ True, WHITE$)$

screen.blit$($score$\_$text, $(10,10))$

clock $=$ pygame.time.Clock$()$

while True:

for event in pygame.event.get$()$:

if event.type $==$ pygame.QUIT:

pygame.quit$()$

sys$.$exit$()$

keys $=$ pygame.key.get$\_$pressed$()$

if keys$[$pygame$.$K$\_$UP$]$ and submarine$\_$rect.top $>0$:

submarine$\_$rect.y $-=$ SUBMARINE$\_$SPEED

if keys$[$pygame$.$K$\_$DOWN$]$ and submarine$\_$rect.bottom $<$ HEIGHT:

submarine$\_$rect.y $+=$ SUBMARINE$\_$SPEED

obstacle$\_$rect.x $-=5$

if obstacle$\_$rect.right $<0$:

obstacle$\_$rect.x $=$ WIDTH

obstacle$\_$rect.y $=$ random.randint$(0,$ HEIGHT $-$ OBSTACLE$\_$HEIGHT$)$

score $+=1$

if submarine$\_$rect.colliderect$($obstacle$\_$rect$)$:

print$("$Game Over!"$)$

pygame.quit$()$

sys$.$exit$()$

screen.fill$($BLUE$)$

draw$\_$submarine$()$

draw$\_$obstacle$()$

draw$\_$score$()$

pygame.display.flip$()$

clock.tick$($FPS$)$