There doesnt seem to be any sound, which is a serious lack. There are bugs in the levels, the difficulty progresses far too quickly, and there is no way to design custom levels.
But it does what it says on the tin: Teaches programming basics while seeming like any other game. Also, the multiple users feature is an unusual and greatly appreciated bonus. Four stars because it doesnt seem to have any competition.
Calion about Move the Turtle: Learn to Code