Good and/or Evil

I was reading about some game design theory on good and evil game play and came up with this idea. 

What if you had an RPG, or any game really, where you play as 2 different characters, alternating between them on each level?

Say on level 1, the player makes the first character push over a box to cross a gap.

Then, on level 2, the player has to make the second character save someone who will be crushed by that same box being pushed by the first character.

Mind blown, huh?

This would could be taken to more extremes where the player is only shown part of a story. Such as character one is tasked with killing a goblin while the second character needs to collect the food the slain goblin was taking back to his starving family.

Essentially, creating situations that are seen as good acts, only to see them in a different light on the next level. This would help to illustrate that good and evil characteristics are just a matter of perspective, which I find pretty dang interesting...

Whatcha think?

Until next time,

-Dave