Thanks!
Yes ,I did it
Actually I joined game development only a few weeks ago so I don't know what the real problem is.
No it is not necessary at all even if you don't kill the enemy but reach the finish line you will win the game
It was intentional. I tried adding a photo but it was showing some error so I left it and submitted the game without it
Thanks for the advice and I will try my best to implement your advices in the game.