You've done brilliantly with that. I've written a few apps/games myself although they're mostly a bit crap [1], and I make about £20 total a month. I think I need to spend much more time on them like you did, particularly in the graphics / UI.

Could you give a bit more information on:

- how you recruited someone to do the graphics for you, was it odesk or similar? how did you choose someone? did you pay for graphics even though you didn't use them?

- marketing. This appears to be the most critical different thing you did compared to other people with similar stories. Could you give examples of the emails you sent out? How did you decide which sites to target? How effective do you think sending out emails was compared to social media?

[1] - https://play.google.com/store/apps/developer?id=Simply+Apped