It's a simple, easy to understand, time killer. It took me around half an hour to complete, which I don't think is bad but I would have like to have had more levels and maybe some on a larger scale with a possible 10+ moves. If nothing else but to extend gameplay.
Other then that it's hard to poke holes in this and I did earn a hundred and eighty five medal points out of it so I can't complain.
An easy 4/5.