CoronaCards has a 30-day trial license, which is nice for a person to test it.
After building a sample app, I noticed that the apps shows a popup "CoronaCards: Trial License Active. “Ok” “Learn More”.
So, my feedback is:
Since the trial license has that popup (which in practice makes not viable for a developer to publish his app during the trial period, I would remove the 30-day limit period.
Or
do the opposite, keep the 30-day limit and remove the popup. I know that by doing this a developer could practically publish his app without having to pay for the final license, but I think in the long term would be beneficial. On any future update, the developer would have to acquire a license since the 30-day period would probably be expired.