I played the 3ds version but the vita version should be the same. The game is somewhat boring. There are some cool things and the way the game does puzzles and platforming is actually engaging at times but it seems the developers though they were making the next 2D action platformer game of the decade because there is so much combat in this game, very often the player will get locked in a room and be forced to eliminate all the enemies to advance, gets old after a while.
The story is some revenge stuff with time travel and boring characters and it seems that to get the real ending you have to play the game twice(not much info on this so i'm not sure).
Dropped the game at the last level because i got tired of fighting waves and waves of tanky enemies. Truly riveting gameplay the got there.
3/5 score. Try it if you want. drop it as soon as you get bored or annoyed.