Well, there is going to be a harder difficulty in the game as well. You will cause double the damage of normal mode, but you will sustain twice as much damage by enemies as well (that is if I remember correctly).

Its a disservice to the game I feel.
Honestly you shouldnt be allowed to go through a game invincible, it ruins the sense of achievement gained, and cheats the user that does it.

Esp for nintendo games, that hardly have any story to them at all.
The gameplay itself is the experiance, and a invicible mode just ruins the game.

*edit:

On secound thought, if you had like a kid thats basically too young to be playing video games.... and still wants to look at the pretty effects on the screen, then sure, let them have that invincible mode, why not.

It beats them playing some free 2 play tablet game instead.

Heaven forbid that Nintendo allow for a game to be played easier so as to expand their potential customer base.

They have a glass cannon mode, ur hits do more damage but enemy attacks also increase in damage

Lol they continue to treat gamers like babies.
Now kids will grow up thinking games that provide just a small challenge are extremely difficult.

They also added an extra difficult mode

This type of option seems wrong. Because then people will just let the ship fly, not move, and clear the game.

Filthy casuals.
I'm just thinking what would it be like if my favorite NES/SNES games had this kind of mode..... ugh.

If Dark Souls had an easy mode, it would be a better game. Just as a hard mode. And this goes for every single game.

They also added a more difficult mode for experienced players. They now have an easy, normal and hard more.