Hey, here is my honest opinion, 

• I liked the soothing music, it fits the game you went for. 
• I liked the graphics, nice pixelart
• Mechanic-wise, I'm not that impressed. You walk to a puzzle piece and the first two levels are completed automatically.  When I was on the third level, I kept dying to the first spike when 'rewinding'. It seemed that I could not jump during the rewind because the player was somwhat glued to the ground. I retried almost 10 but I could not pass it.  
• Story-wise, good idea, could use some improvement. It seems that the depressed girl is in a coma and remembers that she had to suffer troughout her life. Maybe it could improve with a form of text implemented into the game. So you get to know the main character (depressed girl) a bit more. 
• Puzzle piece transitions were really neat.

Overall good submission. Was most a fan of the art, but maybe I'm just bad at platformers.