Pros:
* Well designed characters
* PERFECT MUSIC(I'm listening it for 3 month and it hasn't bored me!)
* Lots of smart gameplay features. Every boss is unique
* It's really good game for testing your reaction and skill
* There is 3 endings! YaY!
* Landscapes betwen levels are really frustrating

Cons:
* Unskippable walking scenes betwen levels. Yes, they're nice and explaing what you've done by lore(or who you are), but still...
* Might be unplayable for some people even on the easiest difficulty

Worth it, especially on sale