This is my favorite platformer of the last several years (and probably the last several console generations). Great art, great music, fun and varied levels, lots of content. I paid $60 for this when it came out and I don't regret it at all -- it's a steal at this price.
I've only played for a couple of hours so far, but the gameplay essentially consists of navigating through an overworld and solving puzzles that you find by entering portals are going down certain pathways. The puzzles are environmental in nature, and the goals consist of things like simply finding an exit or killing all the grays in an area. You sometimes have to forfeit your gear to enter a puzzle area (though you get it back once you finish), so in cases like this you'll be forced to find the necessary gear within the environment before completing your objectives. Replayability is added in that the puzzles have different tiers of completion: you may only have to complete one objective to clear the area, but if you want to get the best ranks in a given area you'll have to complete other objectives as well (completing an area without taking any damage, for instance). I'll likely have more to share as I spend more time with the game.
