Yeah, I heard that originally they were going to put a koopa troopa as the first enemy, but they thought it was too complex, so they added the goomba.
I am going to spend my entire Saturday looking at every 1-4 level in every Super Mario Bros. game. It won't take long to find out your secret .
Ok, yeah. I modded it. My point was that all enemies have a line of code that makes them die to invincible Mario, even if you can't get a star, it's still technically possible for them to die.