I quickly checked out the demo of this last night, its pretty awesome.
Its a bit of a platforming type thing where the game lets the player manipulate time. So if you die, you hold down X and rewind time until a you think you've reached a safe point. The catch is though that each world reacts differently to time.
There are a lot of in-jokes, and shout-outs to the mario games. with goomba-esque enemys, pipes, pirranha plants, but you should finish at least the first world in the demo for the best one.
Its very well designed visually, the art style is a great way of pushing the hardware for a 2d platformer. All the sprites have a hand painted quality, and the tiles of the levels mold into each other so it has a very organic feel. It looks pretty amazing in HD.
CHECK IT OUT.
"Braid is an ingenious and startlingly creative puzzle game, built with an understanding of good game design that even some of the industry's most revered figures could learn from."
PC Gamer Magazine (UK)
"It's the most original and fresh platform game I've played in at least ten years, and almost every single puzzle in it will make you grin with happiness and clap with appreciation at the cleverness of it."
Graham Goring, The Arsecast
"Braid has the potential to change the way you think about reality. It will certainly change the way you think about video games."
Jason Roher, Arthouse Games
"Beyond Braid's enchanting hand-painted visual style, beyond its often haunting score, and beyond its musings on love and personal growth... Braid is one of the most progressive platform/puzzle games we've played in years."
Cam Shea, IGN Australia
"Braid's artistic design is as imaginative as its puzzles. The whimsical world looks like a painting come to life."
Hilary Goldstein, IGN
"Braid is a risky experiment climaxing in glorious success. Ask yourself when last you felt a sense of reward and achievement playing a game; not Achievement with a capital 'A' and ten Microsoft points, but an actual sense of pride... And when did a game really make you look at the world differently?"
Xbox World 360 Magazine
"I love this game.... I feel like I'm using parts of my brain that have never been used before, like parts that haven't evolved yet."
"One of the most interesting, satisfying, beautiful game experiences I've ever had."
Reverend Anthony, Destructoid
"More fun than calculus!"
Chris Dahlen, Save The Robot
"We're not used to being able to manipulate time in the ways that Braid allows you to... You can sit staring at it for hours, feeling entirely clueless as to how the next jigsaw piece could even be possible to reach. But with a bit of patience, everything just clicks, and you can't help but smile to yourself at how elegantly simple the whole thing is. It was never difficult at all - you just weren't thinking in the right way. That's videogaming Zen.
Sean Bell, DarkZero
"Each zone presents a new trick in addition to the time reversal mechanic, many of which defy causality in brilliant and migraine-inducing ways."
"The end level is fucking ingenious."