Elephants meet lemmings meet architect
Graphics = Very simple, but they still look good. the backgrounds are all nice too.
Controls = Very basic and easy to learn.
Playability = Depending on your puzzle solving ability. Its basically trial and error, If your bridge fails you've got to figure out what you've done wrong.
Replay value = once you've figured out what to do, going back through and beating your original time is fun.
Fun factor = I enjoy it alot, its different than all the other run of the mill games out right now. Its pretty satisfying to complete a stage thats complex.
Overall Value = $5 is a steal, Its not incredibly long, But it is fun while it lasts and you'd pay more than that just to rent a game from somewhere.