Hey!
While it is not my type of the game, I must say that I really liked it.
It feels profesional and is enjoyable to play.
I like the idea. It is challanging, but not makes me want to pull my hairs out of my head.
Calming music sets a good mood. Everything feels at its place.
Good job!
Two things that you can consider to improve:
App name has all letters but one in the first row. The last one is in the second. (galaxy s4)
Adds are a little too often for my liking. If you decided that this is the rate that you want to display them, please, consider adding an option to pay a fee, and make them disappear.