That's great...
The experience with the animations and spinning circles is definitely calming... and addicting.
I found it odd that you have to tap twice; first to select the circles, and then to clear them...
Not a big criticism, but I would have expected it to tap, wait, and then clear automatically...
Towards the end of the game, the app crashed, but didn't report an error message... not even an "Activity Cirtropie isn't responding" dialog...
Also, the use of the back button to navigate back and forth between the menu and the game is confusing... traditional applications use the back button once to leave the game mode, and a second time to leave the application. Only the home button or a long press to the back button were able to quit it...
Overall, though, good job.