Intelligently designed and deserving of a certain level of respect, but it's a mistake to call it a masterpiece.
-The story is open to interpretation and the writing style is very unique and refreshing compared to most other games, it's an interesting spin on Super Mario Bros.
-Some ingeniously mind bending puzzles that must have taken a lot of time to design and test.
-The rewinding concept is what sets this game apart and it was well implemented considering that you can rewind all the way to the start of the level if you want.
-Beautiful music that fits the art style perfectly.
Bad:
-A shockingly abrupt ending that no doubt has many players up in arms.
-There is almost always just one way to solve each puzzle, and a lot of concepts aren't the least bit intuitive.
-The difficulty begins like any given platformer but the game quickly becomes so hard that it will frustrate you enough to stop playing on multiple occasions. Even for a puzzle game, this should never be the case during the first playthrough.
-This is not for people who need action and instant gratification that most platformers will offer up, and I'm sure a lot of people threw down the $15 thinking the opposite, and then came and wrote a negative review and it's actually pretty understandable.