Different, how? It was ok, but definitely not ground breaking.
There are not too many colorful post-apocalyptic games that feature fully fleshed-out characters. There are some (FF7 comes to mind) but usually videogames go down the dark and gritty survival tale road. Even the enemy designs were light-hearted (the colorful giant robot dog was great)
I also liked how the characters actually used their brains as well as their brawn in the story
(the dragonfly comes to mind). Plus the atmosphere was mysterious. When I first saw the floating mask I actually paused before walking up and putting it on - it was weird and cool.
The ending could have been more polished but IMHO the journey more then made up for it.