It’s a really nice game. Not an all-time classic perhaps, but still great.
It’s relatively short, looks beautiful (in terms of lovely atmosphere and environments, even if the graphics are no longer cutting edge) and just has a really nice feel when you’re swinging around.
The only flaw is that it starts as a lovely atmospheric indie physics puzzler/platformer and then suddenly gets bastard hard (and subsequently annoying) at about the half-way point. (this is the point where you have to start recharging your grapple from crystals while in the air).
I almost quit it at that point in frustration, but someone recommended the Unlimited Grapples cheat and that fixed it for me. Even with that cheat, some of the later levels are still pretty challenging, but they’re fun rather than frustrating.
Definitely recommended, especially if you like things like Portal (though it has no puzzles or jokes)or Grow Home.