Having just barely gotten a Vita (pretty good deal too) this was one of the games I grabbed right away, and was glad too, cause it's awesome. If you haven't seen/heard of it, it's as you'd guess from the title an action adventure game where you manipulate gravity.
You can walk on walls, ceilings, fly and float, and carry objects/people with you all as long as you have meter to do it. There are also some special attacks and other abilities like the slide, black hole move, and some others with everything being upgradable including base things like health, damage and how long it takes for your gravity meter to run out.
All of that is cool and interesting, and the story so far is interesting as well. It does take a lil bit to get used to the controls and gravity stuff, especially with the camera. Thankfully the D-pad helps with the camera and if you've landed on a surface her hair will fall with normal gravity.
Currently I've stopped going through the main story in order to do some of the side missions and challenges and such to try and get some extra upgrades in. Some of them are pretty damn hard but most get easier as you get more upgrades.
If you're one of the few Vita owners I'd say this is a no brainer to pick up, if you don't have a Vita and as long as there are other games you're interested in, I'd say this about sells the system. Looks great, uses all of the systems abilities with touch screens, gyro, and some extra dlc missions. I sure hope they don't let this nice new IP go to waste =P