The very simple fact that that traversal in GR needs mastery of the R1 button and the levels take advantage of your finesse when needing to collect crystals make it so much more fun even 10-20 hours in.
The basic Gravity Shifting alone was complex and interesting enough to keep me enthralled all the way through the first game (and the first few hours of the sequel, for that matter). But now that they've built on top of it with the Lunar and Jupiter styles? It's pure bliss. I'm constantly switching styles, Shifting, Sliding and Rocket Jumping whenever I get the chance. There is so much cool stuff to do, and the joy of building up your skills so you can get where you want to go faster and more elegantly puts this game right up there with something like Spider-Man 2.
For instance, if you just want to get straight up into the air, the most basic technique is to hit R1 to float, point your camera up in the air, and hit R1 again to fall up. But with Lunar Style you might also want to use your charge jump. But if you really want to get up there fast, you might Gravity Shift straight at the side of the nearest building, then Rocket Jump 'along' it, straight up into the air. But if you
really want to motor, you can Lunar Gravity Slide straight into a building, which makes Kat automatically start Sliding straight up, then Rocket Jump straight out of the Slide, which will get you miles into the sky in like half a second.
