Likely the most brilliant puzzle game of the last few years. Short and sweet - I beat it in two, three hours - but absolutely ENGROSSING.
The setting, the character(s?), the general feeling... the most immersive game I've played since Super Punch-Out!!. It's challenging, but not "head-against-the-wall" hard. The humor is FANTASTIC, but it never overshadows the gameplay.
Honestly, one of the best PC games I've ever seen. Not a single fault.
It's an First-Person puzzle game. Not, like, a Tetris puzzle game - like a sequence of puzzles from Metroid Prime or Zelda. Nineteen levels of brain-bending.