I have to agree with Niven on the bad aspects when it comes to making a mistake.
I would say a happy medium would be to just send the player back to the beginning of the tutorial, rather than to close the entire game. You WANT people to play your game and stay in the game for as long as possible, and by kicking the player out completely, you lose immersion and disincentivize the player to continue.
When I started over, I noticed that the name would change in the tutorial menu, which is a great little hint at what's going on, which is why I think going straight to the tutorial would be better than having to re-open the game and sit through the credits. I end up spam clicking until I'm caught up to where I was anyway.
But that's my two cents, AMAZING game, otherwise! :D