Android game - Handy Brush

I am working on a little game for Android which I am making with Unity. The gameplay itself was created very quickly, but making all the GUI assets turns out to be quite a time consuming process.
I managed to make a working sample which I uploaded to the google play store. At the moment of writing I am still awaiting its release.

When that is all working as I want it to, I will also have a look at Google play services, achievements and more levels.