Shoot, I already bought the game before I saw the promo codes. But I can already tell this is worth th $0.99 to me. I've only played through the first few levels, which have been pretty basic, but I've already decided that this is my kind of physics puzzler. The one great thing is that your solution is saved when you exit a level. I love that feature! It drives me crazy when I have to go back and try to figure out how in the world I got the score I did on a particular level.
This game is going to be hard to put down. Great job, Donut Games!