No offense, but that app really blows. Really good on you if you were able to milk 30k out of it :)
Simple and mindless(pardon not meant negatively) sells. Make apps for the audience who buys apps; males 18 to 34(though 34 might be a bit high) if you aim is to money. Something that makes people laugh and want to share it with their friends who buy it and share it with their friends and so on. iFart & Fat Booth(though idea is mindless but tech isnt) are further examples.
Aren't people allowed to not like an app?