It's raining numbers

Oh my Gosh...so much rain today, it must be winter already!
Take your little bucket and help me gather these raindrops!
Be careful, don't collect all of them, just the ones that carry the correct number inside!
If you add your gathered raindrops you'll get the target sum on the top left corner of the screen!
Yuppieeee you made it!

You can choose between three different difficulty levels if you think the default game is easy, and test your potential.

This is my first game development attempt. It has completed during a university project. It is based on kids between 8 - 15 interaction with new technologies (smartphones, tablets) and on the familiarity with the addition of numbers. It uses skeuomorfism from real life objects (rain, bucket).
The whole development code is based on matim-dev.com online tutorial.