Great game, easily 5 stars. Just my type of thing. Like others I keep dying at the higher levels when most numbers are over 5. Right now I'm getting scores around 40-50k, though I realize a bit more strategy would yield higher scores.
Downloaded the app also. Love that there are no ads, though I personally actually think you should add some, and add an option to pay to get them removed. You deserve to earn some money for this game.