Amazing.
Next to Portal, this is the most unique puzzle game I've ever seen. It's simple yet challenging, and unbelievably fun! I love puzzles, but sometimes puzzle games become too hard to finish. This is an exception. I've only needed the walkthrough twice (so far), but only when desparate. Kudos to you, my friend! =3
Although I did a minor glitch: Sometimes when entering the time portal, it doesn't transport you back in time, and the clock freezes at zero.
Great job, and please know that I deeply respect you.
~Pelo