First of all, what cute art! The style is very simply but whimsical, so it set the tone very nicely. I love how it was a rather basic premise with a very intriguing mechanic. (Also, I really liked the sound effects and music! They weren't overwhelming and added very nicely to the experience!)
The rewind was mildly confusing, so I'm glad you put in that tutorial level. Still, progressing through the tutorial was a little confusing as well. I was never sure if I should click on something or move around or just wait on the screen in order for it to proceed to the next step. Still, I was glad it was there at all, because it would've been much more challenging without it!
I liked how the puzzles gradually became more challenging. This is especially important in puzzles games, and I think you did well here!
I think with a little more polish and some more playtesting, you could make this even better. Still, it's really great and I love the concept! :D