As you asked, I'am leaving a review.
So... It was a pretty cool! I like that mechanic . All puzzles was intersting, but we need more! Anyway, everything got + and -. I thing it would be better if you add some "help signs" like arrows that show player where he have to go next, especially in the begining. Please, add more languages(russian, chinease, korean, german, french and etc.).
I love it! 8/10