Beret (freeware, Win/Mac/Linux) is the best game I've played this year. It has gotten a shockingly small amount of press despite sporting some of the most consistently well-crafted level design I've seen. It may on the surface look like an early-90s 2-D platformer, but it is in fact a brilliant puzzle game in disguise. Its central mechanic is limited-range telekinesis, and while it steadily introduces new, novel elements throughout the game, your little avatar gains no new abilities. It also makes use of a save-/restore-state feature to distill what might otherwise feel like action sequences into their pure puzzley essence. And while the developer has implemented an unlockable level-editor, at the moment no user-crafted levels have been posted to the game's burgeoning forum. Please fix that.
Note: the game will take you over 20 hours to complete.