Drop One Skill Game

I am no expert but after watching a few video and working out problems and issues i have finished my first game which is now in google play store. As a hobbyist i have made this in my spare time on and off for months most of you would have done it a different way but i am learning and there are bound to be issues most of you will notice. But please be kind any feedback would be much appreciated.

This is a skill game with multi levels to work though the game is just for android and dose contain adds which can be removed.
The game is in google play store at:

https://play.google.com/store/apps/details?id=com.TreeThreeKidsGames.Dropone

A few screen shots.