Last week I launched a complete redesign of the app. This included UX improvements that make the gameplay simpler and more informative. It is also the first version with a professionally designed UI. I took help from a contractor to design two screens, and using that theme designed the rest of them myself.
I really wanted to see if a better looking design would impact conversions, but so far it seems it hasn't created much of a difference. I'll wait for another few weeks to pass judgment though as people might take time to make a purchase decision.