I have no idea why Steam says I only have 87 minutes in this game because that is a lie. Not only have I beaten this game but I have beaten it to 100%.
Of all the puzzle games I've played, this was one of my favorites and still kind of is. It reminds me of the kind of game you would see on a flash website, play every now and then, leave it alone for a few days, then come back and play it again. It's tough, thought provoking, and even give you the chance to award yourself for creative strategies when you beat a stage (even if that can be used as a form of cheating to some extent).
The only complaint I have about the game is the music, not because it's bad, but because I've heard it so many times, I almost suggest putting on a Pandora relaxing radio station when you've finally gotten tired of the track. Other than that, I recommend it for those who want to relax, take their time on obstacles and need a quick breather from their life.