The game definitely has extremely high potential. It has a good, polished look to it, has a very sleek and non-invasive interface and overall presents itself extremely well.
About the only qualms I have is regarding efficiency and precisely what it affects, secondly I would like to know what the cost of mines would be at the 10x and 50x settings. As it stands clicking on them does not tell me what the mines would cost at those increments.