Add trial version for tables and smart phones
I like to support developer of good appliations. That is why I bought your game for Android tablet, but only after pirating it first. If I couldn't pirate it and try it for free, I wouldn't buy it. Now I even recommended it to the teacher of my class. She really likes similar tools for kids.
My point is, that you should add a trial version (maybe first few levels or the first stage) available as a trial. Otherwise you're loosing money, because people won't pay for something they can't try.
your new customer ;-)
We released DragonBox Lite a few days ago, a trial version of our algebra games!