Braid is best described as a few hours of the best puzzles I have ever encountered in a video game, expressed in a gorgeous hand-drawn 2D world, with an instrumental soundtrack that sounds wonderful both forwards and
The game was designed, coded, and funded by one person, Jonathan Blow, who seems determined to uproot every cliché in the game industry.
If you like quick common-sense puzzles in video games (e.g., Half-Life 2, God of War, Uncharted, Metroid Prime, Shadow of the Colossus, The Legend of Zelda), you must purchase and play through all of Braid. Every puzzle you solve requires you to question our day-to-day view of time and space, without the painful formality of a high-school physics class.
The only two weaknesses of the game are its short length and difficult story. Given the extraordinary density of inventive design in the game, its relative brevity is easily forgiven. As for the story, if you enjoyed games like Metal Gear Solid 2 and BioShock: Infinite, you will find Braid's plot rewarding, though it might take some thinking to earn the rewards. Just don't expect to like the plot without effort.
If Braid is the start of Jonathan Blow's visionary quest to enrich game design, I can't wait to see what's next!