I enjoyed it a lot. It tests your ability to think algorithmically by programming a little robot to perform a simple task. You have a "main" method which consists of as many as 12 atomic provided statements. Of these statements there is a call to one or the other of 2 functions, which have 8 slots for statements each.
I plan on playing at least one more time to see if I can reduce the number of statements I use (which it keeps a total of over the course of the game).
If you have some free time, I definitely recommend trying this game out.